Not the George Clooney one but the DIsney Channel film about the children of four Disney villains being sent to a prep school for good guys. Complete with over-the-top acting, a glut of auto-tune songs, and some very odd costumes. The sheer cheesiness makes it a must for riffing.
Tamsin Parker commented
And they should riff on the sequel as well.
Actually, this movie was directed by Kenny Ortega, the director of High School Musical.
I feel like the entire plot to this movie could have been avoided if Auradon just had a competent Social Services department.