What's the funniest thing you've ever seen on YouTube?
Off the top of my head, I can't remember laughing at anything more than this: http://uk.youtube.com/watch?v=7w1gjX_GeIY
Funniest Thing On YouTube
Very funny, may just have turned me gay.
I had to confirm I was old enough to watch that! haha
http://uk.youtube.com/watch?v=5X1VIyZe3Ws
this has to be my favourite although star wars kid at the time was pretty hard to beat.
There's something very infectious about 'the giggles.'
Not rib-tickling funny but certainly amusing.
Two computers duet Frankie goes to Hollywood's 'The Power of Love' in 8-bit style:
http://www.youtube.com/watch?v=O1wx1bVAQZE
Incidentally, it was Brian Nash, the guitarist in Frankie that posted this link on another forum.
Perry: Please send me your address. My psychiatrist would like to know where to forward the bill.
Nick: That is indeed hilarious. Even better with the full translation. Brilliant stuff.
Tuumble: Immense. 
The hell-for-leather hamster: http://www.youtube.com/watch?v=YXRH50fvHWA
Still makes me laugh lots to this day
Dan
Hahah, classic. (If not a little abusive.)
http://www.milkandcookies.com/link/5612/detail/
Perhaps not the funniest, but wait for 24 seconds.
What the hell is this advertising?
Mentalist.
It's adveritising mentalist, is that a mint chewing gum, for the mentally unwell?
Yes.
http://www.milkandcookies.com/link/93292/detail/
Another not the funniest, but I love these faked trailers.
Quote: sootyj @ February 19, 2008, 8:45 AMhttp://www.milkandcookies.com/link/93292/detail/
Another not the funniest, but I love these faked trailers.
Brilliant! 
I like this http://www.youtube.com/watch?v=MSqgObzQWVA