Waxwork
I'm a little surprised it wasn't already on the list. This gem stars Zach Galligan (Billy of 'Gremlins' fame) and has a bunch of intensely stupid people getting shoved into horror wax museum dioramas. Of course, the dioramas are cursed and once shoved in, the people may or may not remember who they are or something... before being killed by the monster inside said diorama. Lots of guest appearances/cameos by famous monsters who've been in generally better films-- all your favorites! Dracula, the wolf man, Audrey 2, the Mummy, uh... the Marquis de Sade... sure. Of course, the effects and dialogue are sufficiently cheesy.
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tsarstepan commented
Yes. Please riff this already!
https://www.youtube.com/watch?v=Po3aTMsR_OE