Bart! What are you doing here? Uh, not smoking reefer. Uh, ...
(Lisa spots Bart and his Blues muscian friends hanging out in the attic.)
Lisa: Bart! What are you doing here?
Bart: Uh, (Stammers) not smoking reefer.
Blues Musician: Uh, that's right. We--we all not smokin' reefer.