'Senior Trip' 1995
This was originally titled "National Lampoon's Senior Trip," but then somewhere along the way the beginning was dropped, so it became "Senior Trip" or sometimes "Senior School," according to IMDb. I was flipping through the channels with my roommate one night and, after reading the description of this one, we settled on giving it a shot. We were both too exhausted to stay up for the whole thing, but vowed to finish watching after enjoying the first 20 minutes.
We did finally finish it a couple of weeks later and we were both thrilled we did. This movie is Jeremy Renner's first feature film, and he plays a stoned, partying deadbeat who would rather throw a party at the principal's house than attend his classes. He pairs with another stoner, and they cause all sorts of trouble.
They end up, along with a mix of students, in a "Breakfast Club" style detention, writing a letter to the president about the problems with the country's education system. They then go to D.C. to present about the issues and I'm sure you can imagine what happens next. With Tommy Chong as the bus driver who eventually "parties himself to death" on the trip, you really can't go wrong.