As a child, Dave Grohl developed the habit of drumming by clicking his teeth together. He demonstrates in the video below. Also during this BBC News interview, he also confesses to being a "UFO nerd" but that should come as no surprise given that he named his band the Foo Fighters after the term US pilots in World War II used to refer to UFOs. From the BBC News:
What did you think of the supposed UFO images that the US government released this summer?
Oh, I'm a total UFO nerd and I have been for decades. So I've been following it – but what's happening now, I don't think is new.
I'm of the belief that that we are not alone, and I'm totally okay with that, you know? It doesn't really change my day too much. But I'm the romantic type. When I look up at the stars I think, "God, I hope we're not alone." What a drag that would be.