a guy doing all kinds of accents 

http://pl.youtube.com/user/victorlinguist

Amy Walker, 21 accents (Jacek Śnieżko, IOU)

you can also try

http://www.youtube.com/watch?v=eWVIObGHxzs

how to paint Mona Lisa with microsoft paint

William Shakespeare, Sonnet 130

Monty Hall problem - something to think about (Jacek Turula, IOU)