www.ytmnd.com
Awesome site, you upload a picture, a .wav/.mp3, type some text in and voila! Your own YTMND... Check out some of the previously submitted ones... they're hilarious (Just make sure you know what you're clicking... some are quite disturbing...)
Post your favourites here. I'll start.
http://neverending.ytmnd.com/
http://cereal.ytmnd.com/
http://stapler.ytmnd.com/
http://spreadmystaplerandflyaway.ytmnd.com/
http://staplercalledlove.ytmnd.com/
http://superstapler.ytmnd.com/
http://khankhan.ytmnd.com/
http://whatsnewkhan.ytmnd.com/
http://realamerikhan.ytmnd.com/
http://picard.ytmnd.com/
http://tetrisblah.ytmnd.com/
http://fatslob.ytmnd.com/
http://bethanym.ytmnd.com/
http://haxorzingthingy.ytmnd.com/
http://staplerdentalplanlol.ytmnd.com/
http://lskts.ytmnd.com/ (Personal favourite )
http://lmao.ytmnd.com/
http://steamloller.ytmnd.com/
(Note that the sound doesn't work in firefox, so if you wanna hear it you'll have to use... IE...)