http://www.youtube.com/watch?v=B7QIcxoJU4g
(I'm not sure how to emulate, sorry!)
That one is just priceless too.
http://www.youtube.com/watch?v=LHgEnN2PFzo&feature=related
And that one might be even better
A few that are good, but not great.
http://www.youtube.com/watch?v=lKlG0UY-dTU&feature=related
http://www.youtube.com/watch?v=vVo3xT3cHBA&feature=related (You can see the original in the response part)
http://www.youtube.com/watch?v=BGDnQevz54I
Edit: I see someone beat me to Kaboom. It's what I get for opening a page 20 min after I originally opened it.