Accidental Beach Boys hit from 1965. The complete version is much longer than the edit most people are used to hearing on the radio, and features more laughing, talking and general silliness.
During a break from recording 'real' songs for the album Beach Boys Party!, Dean Torrence from Jan and Dean had come by to visit and they all began chilling, talking, joking and jamming. Someone flipped on the tape and they played this old song, Barbara Ann, with Dean on lead vocals. Clapping hands and a tambourine provide the percussion, and at one point, Carl Wilson begins banging two ashtrays together. You can tell they're ashtrays because he says "Carl, and his famous ashtrays!" before klinking them together to the beat. Recorded in jest, it was ironically the album's only hit song.