Okay, I've come across some pretty funny shit on YouTube lately, and feel the need to spread the joy with everyone else.
I'll be nice and put them in a cut, but seriously you guys, check this shit out.
First off, we have "My Humps" covered by Alanis Morisette. Yeah, you heard me. I'd written her off as a whiny little sellout, but the fact that she has a sense of humor like this completely redeems her to me.
For anyone who's seen all the violence and gore that is the movie 300, here's the PG trailer (complete with cake and ballons in place of swords):
Here's "Immigrant Song" by Led Zeppelin with subtitles of what they actually sound like (much like Fallout Boy's "Sugar We're Going Down"). It's kind of hard to read, but funny.
Here's a Star Trek (original series) montage to Jefferson Airplane's "White Rabbit". (If you like this, and think it's funny to mock the sexual tension between Kirk and Spock, also watch "Babe I'm Gonna Leave You" and "SexyBack")
"Knights of the Round Table" from Monty Python and the Holy Grail as done by the cast of Star Trek (seriously, this is brilliantly funny):
"Knights of the Round Table" done entirely by Legos (possibly more brilliant than the Star Trek one):
Darth Vader: The Musical. (done to Andrew Lloyd Webber's "Phantom of the Opera")