some funny sketches and clips 
http://www.youtube.com/watch?v=AeY0KxFbMok&feature=related
http://www.youtube.com/watch?v=pfvNU2PENrM
http://www.youtube.com/watch?v=izn_0AxHADs&feature=related
This one is really funny… (Ali G)
http://www.youtube.com/watch?v=wN18lJ_uE7Q