The Foo Fighters frontman was about to play Best Of You when he went into a story about going to a party at the former Beatles' house and watching the legend perform a song on the piano… only to end up jamming out with the two superstars while incredibly high!
Here's how Dave sets the scene at McCartney's house, fresh with an unlikely assist from "Batman," as he refers to T-Swift (below):
"So we were at a party and Paul was there - we're hanging out and having fun, there's a piano in the room, and Paul gets up and starts playing a song, and it's amazing. By the way, just so you know, Paul McCartney is the baddest motherfucker in the world, he really is. You kind of forget that not only is he the coolest, but he's also the best.
"He's cool, man, he's fun to hang out with! So he starts playing a song on the piano that's in the house - in the living room - and it's blowing everyone's fucking mind, it's so cool. It's a new Paul song, weird. Then he finishes the song, and everybody looks at me like, 'Come on, Dave! Play a song!' I'm like, 'I don't know how to play piano, I don't know what to do, I can't play fucking piano!'
"Then I look around and Paul McCartney's left handed, so all of the guitars are left handed. 'Shit! God, I'm screwed, what do I do?!' Also, I maybe smoked a little pot, so I was already challenged enough. I was like, 'Oh my god, what do I do right now?!' All of a sudden Taylor Swift stands up and says, [squeaky girly voice] 'I'll play a song!' I was like, 'Thank god, Taylor Swift is here! Fucking Batman when you need him!' So she gets on the piano and I think, 'Okay, I'll jam with her.'