Ytmnd.

[King Aquamentus]

This website has been picking up a lot of popularity lately.
Sure, not all the sites on it are that funny, but a few of them are. If you don't mind a little racism, you'll love listening to the Super Mario Bros. Super Show "Do the Mario" song in german:

http://supermarionazi.ytmnd.com/
(Warning: not safe for work)

[Linkafier]

Yeah, it's awesome. 'Greatest pop culture site out there. There are a lot of "fads" that pop in and out of there.

[ZomfgIts0rzlolo]

YTMND's are either sickeningly stupid or the funniest things you've ever seen. Mostly sickeningly stupid. Still jawesome though.

[MANDRAG GANON]

Wow...I thought this place had died... I remember like a year ago it was really popular and then it slowly dissapeared, I think alot of thier site started going down too. Still som eof them are great, I still like the captain jean luc picard song one :o

[King Aquamentus]

My new favorite is the German version of "Do the Mario". What does it sound like to you?

Other fads I liked were the "Sonic says" series and Star Trek 2: the wrath of KHHHAAAAAAAAAAAAAAAAAAAAAAAAANNNNNNNNNNNNNNNN!!!!

Some are quite original, though.