At the Hollywood Bowl they have an annual tradition of a "Grease" sing-a-long. It's exactly what it sounds like. A bunch of people singing "Grease" songs. Fun!

This year, the 35th aniversary, Dave Grohl stopped by. Plus as a bonus during Sha Na Na's warm-up set, the Foo Fighters frontman, wearing an uber flashy red blazer, joined the band on drums during a cover of Little Richards' 1957 Grease-era hit, "Lucille."

For some reason whoever filmed this also talked through much of it. If you're going to record a video and later post it to YouTube, shut the hell up when you're filming!