Two teenage Giant Floating Brains, who although they were both gender neutral, they both self-identified as male. These teenage Giant Floating Brains were just floating around at the park one afternoon with nothing to do when one of them telepathically communicated:
(Oh yes, and they have chosen the names of Doug and Carl as their Earthly identities.)

Doug: "My IQ is larger than yours is!"

Carl: "That may be true, but all of the teenage gender neutral, but self-identifying female Giant Floating Brains say that I have cutest and best looking cerebral cortex that they have ever seen."

-A Giant Floating Brain floats into a bar and says:

GFB: Inferior human life-form, bring me a "Flaming Einstein!"

Bartender: Why do you Millennials always end up in my bar asking for those crazy drink names that nobody has ever heard of?

GFB: Do you wish for a mind transference of data ingredients for a "Flaming Einstein?"

Bartender: Huh?

GFB: Take a glass quart container, add 8.05 ounces of premium, not regular, unleaded gasoline. Now add 3.12 ounces of fresh cloves, followed by 4.11 ounces of vinegar, and 5.33 ounces of rubbing alcohol..........................
...logic dictates that I take over your brain, make my own drink, and then use your inferior brain to take over the world.

-A short while later.

Bartender: Attention! All inferior human life-forms in this bar! Any homo sapiens ordering a "Flaming Einstein" will receive their drink on-the-house, for free. This is a limited time offer!
You have approximately twelve minutes and thirty-two seconds to order and enjoy your drinks before I take over your world!

Have a nice day. (Or what's left of it!)

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-A Giant Floating Brain floats into a bar and says:

GFB: Inferior human life-form, bring me a "Flaming Einstein."
In fact, make it a double.

Bartender: Yes Sir...Ma'am...It....or whatever it is you are.

-The bartender has no noticeable reaction to the drink request or to the GFB that has placed the order. He proceeds to make a "Flaming Einstein" with all of the proper ingredients to exact perfection.

-He sets the "Flaming Einstein" on the bar and says:

Bartender: You know that looks so delicious, I think that will I make one for myself as well.

-The Giant Floating Brain is stunned, and this is noted by a slight reddening in it's cerebral cortex area.

-The bartender then makes himself a "Flaming Einstein" properly ignites it with a blowtorch, after which a volcanic like eruption spews forth from the glass, followed by a dazzling looking fireworks-like display, accompanied by four loud explosive retorts, and when this all subsides down to just a small reddish-blue flame on top of the glass, he drinks it all down in one quick gulp.

-The bartender hiccups twice with pink smoke coming out of his nose, and lets forth a deafening thunderous belch, accompanied by a whitish-blue wall of flame that incinerates three bar patrons sitting at a table ten feet away. Leaving nothing but smoldering ashes.

-The Giant Floating Brain cannot believe what it's synaptic receptors have transmitted to it.
Before it is able to communicate it's profound incredulous reaction, the bartender suddenly breaks out in loud spasmodic uproarious laughter accompanied by some residual smoke and flame from his mouth and nose and he then says:

Bartender: Haw haw, Glozoorpee, if you could have only seen the noticeable redness and swelling of your cerebral cortex. This is just priceless. Hoo Hoo.

GFB: None of this computes to be logical?

Bartender: This is all easily explained Glozoorpee. Like you, I come from planet Arous also, my name is Bloozeneep, and I entered this bar about six months ago with the intention of taking over this inferior human bartender's mind and ruling this world.

GFB: Proceed, I require more data for comprehension?

Bartender/Bloozeneep: After I took over his mind, I consumed a few dozen "Flaming Einsteins", I then logically came to the conclusion that I could make some decent Earth money running this bar, and have as many "Flaming Einsteins" as I wished to consume.

I have become accomplished in mindless Earth chatter, and off-color Earth jokes.The bar patrons love me, and show their appreciation with generous tips. The still smoking ashes that you see in front of you were formally my best customers, and really good tippers. I already miss them.
I really need to keep reminding myself that I shouldn't gulp down a "Flaming Einstein", it gives me terrible gas.

GFB: Bloozeneep, this is all so incredibly logical.

Bartender/Bloozeneep: I am actually having FUN. This is something that is not allowed on our planet Arous.

Bartender/Bloozeneep: Drink your drink Glozoorpee, your flame is beginning to fizzle out, and I will proceed to make us both a couple of more "Flaming Einsteins" to toast this completely logical occasion."

Life on planet Earth is good.

-John Agar's Giant Floating Brain Jokes-

John Agar: "Better laugh or the Giant Floating Brain will take control of your mind and use it to rule the world!"

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Q Why did the Giant Floating Brain cross the road?

A) So it could get to me, take control of my mind and use it to take over the world.

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Q) What do you get when you cross a Giant Floating Brain and a lawyer?

A) I don't know but it charged me a huge retainer fee, lost my case in court, and then it used my mind to take control of the judge and jury.

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Q) How many Giant Floating Brains does it take to change a light bulb?

A) One. First it takes control over my mind and forces ME to change the light bulb, and then it used ME to take over the world.

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Q) Why do Giant Floating Brains make bad pets?

A) Because they are difficult to potty train, and if you take them outside, they try to take control of the park.

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Q) Why did Giant Floating Brain hate Facebook?

A) Because GFB felt that Facebook was discriminatory in requiring that you needed a face to become a member, and Facebook has already taken over the world anyway.

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Q) What's worse than a Giant Floating Brain taking over your mind and using it to destroy the world?

A) Forgetting my wife's birthday last month.

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Q) Why did Giant Floating Brain refuse to see the movie "IT" in the movie theater?

A) Because it is a well known fact that Giant Floating Brains are afraid of clowns and are highly allergic to popcorn.

John's Fun Facts: "This is why you never saw any clowns in 'The Brain from Planet Arous' and you never saw me or any of the movie crew eating any popcorn, on the set."

Years later John Agar commented: I don't know where they found that Giant Floating Brain (GFB), but GFB was not much of an actor. GFB was very difficult to work with. GFB kept forgetting it's lines, GFB never seemed serious about it's role and was always mugging for the camera. That's probably why GFB only did this one movie and you never heard from it again. Instead of taking over the world, I heard that GFB ended up working at a local burger joint in a small town in Iowa.
Many years later, I was told that GFB retired and was living in the Bronson Caves in Los Angeles.

https://www.youtube.com/watch?v=yWvSge9BK7s
If you aren't convinced, if I may:
John Agar.
John Agar wearing horribly painful looking metallic contact lenses.
John Agar smirking and mugging all over the place.
Giant Brains.

I've always liked this old horror movie. An alien from another planet, that looks like a giant floating brain with glowing eyes, wants to take over the earth. It needs a human host to fulfill it's mission, John Agar unwillingly fits the bill. The brain (via John Agar) wastes no time in showing authorities how adept he is at mass destruction. This could have been accomplished much quicker and more thoroughly, if the brain had become a politician instead. A riffing of mass destruction is called for here.

My three reasons:

1) John Agar
2) A floating brain with Muppet eyes
3) A dog named George that gets possessed by an alien brain

What more could you possibly want?