Scary Movie (2000)
There are so many teen slasher movies that they're basically their own genre -- so much so that they're a ripe opportunity for a spoof. These, plus several other horror classics, are parodied in Scary Movie to a ridiculous extent. Starring early 2000s regulars like Shawn and Marlon Wayans, Anna Farris, Carmen Electra, and others, the sex-ed up ensemble comedy probably would've been way too crude for audiences today, were it released now, but it's remained a teen cult movie, likely for its very shameless form of hilarity. It's obviously a little better to be able to catch the references, but really, it's just an unhinged, late-night favorite.