The movie was about this somewhat rebelious teen and the principle ended up taking people hostage in the school, it was almost like a private school, maybe it was... but it was like a huge castle... anyway, this kids little sister ends up being one that is kidnapped and he goes to save her and settle his beef with the principle, and it ended with the rebelious kid and the principle chasing each other in tunnels in go carts and the principle flew out the tunnel pipe and into poop water.. that's about all I can think of.
WHAT IS THE NAME OF THIS MOVIE! PLEASE HELP

Masterminds (http://www.imdb.com/title/tt0119630/)