I may get some crap for selecting this one, but it's a goodie. Arnold Schwarzenegger plays Detective John Kimble, who is forced to be a substitute teacher after his partner Det. O’Hara (Pamela Reed) falls ill at the last minute. Kimble has his troubles taking control of the kindergartners while maintaining his secret of being an undercover detective.
Kindergarten Cop saw a resurgence of popularity in the early 2000s due to the rise of celebrity soundboard prank calls. This movie had several great lines for that kind of entertainment.
A sequel was released direct-to-DVD in 2016, starring Dolph Lundgren (known best for his role in Rocky 4).