I need a good prank for a school prank for a field trip?

Brandon K asked: Ok, our school is taking a big music trip to Canada for a week... I need a great prank that people that will remember. Me two of my friends and a girl that's my friend are gonna do it. We need a good one. We are in high school.

A Texan, on a trip to Ireland, enters Paddy’s Pub and challenges all of the lads in the joint?

madrom asked: He loudly and brazenly belts out, I hear you boys are supposed to be drinkers. I'll give any one of you here $500 dollars if you can line up 24 pints of your finest stout on the bar and drink them all in less than an hour!
The lads and lasses in the [...]