During a recent show at the legendary Troubadour in West Hollywood, California, Mumford And Sons brought out Mark Hoppus for a performance of Blink-182’s classic song, “What’s My Age Again?” T-Bone Burnett and Rage Against The Machine guitarist Tom Morello also joined in. You can watch a fan-shot video below. Be sure to leave us a comment with your thoughts.

Watch: Tom DeLonge gives interesting response to Blink-182 question at Comic-Con