Getting Rickrolled is still funny after all of these years, and to have the singer of the "Never Gonna Give You Up" song on stage with the Foos was the ultimate roll. 

The audience at the Summer Sonic Festival in Japan got a special surprise when the band announced that their new best friend would be joining them on stage. Dave Grohl said that he met Rick Astley like two minutes before the performance. The huge grin on drummer Taylor Hawkins' face at about the 1:25 mark is probably my favorite part of the video. That and the fact that at the beginning Rick encouraged the crowd to sing the lyrics in the first verse. I don't thing many people actually know anything other than the chorus of that song. I can't lie, had I been there, I would have been going absolutely crazy! The Foo Fighters seemingly never run out of new ways to entertain the world.