Well... we have funny pic thread.
so
Whatever you Like: Da Obama version
http://au.youtube.com/watch?v=b-yJBsjatW0&NR=1

meh, there's a dang good reason a president can only serve two terms. Song seems to ignore that.

A Left 4 Dead one thats making an entirely new scene out of ingame dialogue, a rather pervered scene
http://au.youtube.com/watch?v=NW8tE93Vx8Q

McCain 'PSA'
Obligatory Charlie the Unicorn clip
And the second one
What is wrong with the 1980s? This!
Head On! skit
Food court musical
That orta keep you going for a bit.

Ultimate Showdown
Creation Science 101
Karl

I forgot about Roy Zimmerman. Be sure to check out his other work afterwards as well.

Food Court Musical is so plain epic. thx a lot
oh
news about a new thing called internet.
http://au.youtube.com/watch?v=LwQYyUoOA7w&feature=channel_page

Yah, Improv Everywhere are great.
Internet. Even at the start we did not use "THE Internet". And sometimes, no capitals for our internet. lol internet.

Have you tried to turn it off and on again? Medieval style.
http://www.youtube.com/watch?v=pQHX-SjgQvQ

H.P. Papercraft

Probably not as funny as the others, but still good if you like L4D
http://www.youtube.com/watch?v=q7uIchu4JJo

http://vimeo.com/moogaloop.swf?clip_id=1778399&server=vimeo.com&show_title=1&show_byline=1&show_portrait=0&color=&fullscreen=1
not really funny but.
People jump with wingsuit from cliffs in Norway. Simply amazing.

http://www.youtube.com/watch?v=UA_ATLFxIA4 (klipp contains a streetfigher parody thats better than the whole streetfighter movie.
or
http://www.youtube.com/watch?v=rW6M8D41ZWU now this is a good song, unlike that Rickroll bull, this one needs to be spread word about, its made by some of Japan's best known comedians, this performance have even been on amerikan tv, some show kalled Kimmel show or like that..

This only really funny to Germans (and of course, Swiss): "My mobile". A Swiss rap song about mobilephones :)
http://www.youtube.com/watch?v=N8lE2Ux0cxE
Part of it is currently my ringtone :)