My favorites, in no particular order:
http://www.youtube.com/watch?v=4gO7uemm6Yo
http://www.youtube.com/watch?v=1WqazleR3FE
http://www.youtube.com/watch?v=6J_3rsEwYVE
http://www.youtube.com/watch?v=4gO7uemm6Yo
http://www.youtube.com/watch?v=1WqazleR3FE
http://www.youtube.com/watch?v=6J_3rsEwYVE
"How is it that a lame man does not annoy us while a lame mind does? Because a lame man recognizes that we are walking straight, while a lame mind says that it is we who are limping." - Pascal