These all make me laugh.

http://www.youtube.com/watch?v=1O1nzmHpYH0&feature=related
http://www.youtube.com/watch?v=oFux_Pj4e4c
http://www.youtube.com/watch?v=vbCYr7aYJss
http://www.youtube.com/watch?v=xh7qT8YSTUY
http://www.youtube.com/watch?v=fe7dsMVXfmo
http://www.youtube.com/watch?v=ekZX3UQiiZ4