There are 4 videos here. The last 2 are far and away i would say the best. But really you should watch them in order just to see how these pranks escalate. Both of these guys work for collegehumor. Theres a little bad language in them so theres the warning for ya.
Prank 1
http://vimeo.com/clip:148233
Prank 2
http://www.vimeo.com/clip:151473
Prank 3
http://www.vimeo.com/clip:169128
Prank 4
http://www.vimeo.com/clip:175519
Prank 1
http://vimeo.com/clip:148233
Prank 2
http://www.vimeo.com/clip:151473
Prank 3
http://www.vimeo.com/clip:169128
Prank 4
http://www.vimeo.com/clip:175519