I ran across a forum topic on Rock Band's website, which was pretty funny.  You know those "Facts about Chuck Norris" jokes that went around awhile ago?  Well, someone started a "Facts about Dave Grohl" thread, which was suppposed to be mainly about Dave Grohl Rock Band trivia, but then people started going crazy with it.  A lot of it was re-hashes of the old jokes with Dave Grohl substituted for Chuck Norris.  Not that funny.  But here are some pretty funny ones that were not obviously Chuck Norris rip-offs:

Dave Grohl played all the instruments for every song on the Foo Fighter's debut album. All at the same time.
Dave Grohl played the drums on Polly only by using telepathy.
For every Rock Band game (excluding Rock Band 1), the end credits have a part that says: “Special thanks to Dave Grohl for being Dave Grohl."
Dave Grohl only wants the best the best the best the best the best the best the best the best the best the best the best the best the best the best the best the best the best the best the best of you.
Dave Grohl is the only living human who Chuck Norris fears. Greatly.
Dave Grohl did not actually play drums on Bleach.  He played everything else. And then drums.
"Smells Like Teen Spirit" got its name after Dave Grohl passed gas in the recording studio.
Dave Grohl is referring to himself in "My Hero."
Harmonix once tested Dave Grohl: Rock Band. There were no survivors.
Dave Grohl walks into the studio, five seconds later one full album done.

I hate Dave Grohl.