During a dinner dance concert in high school, our jazz band made a group decision. We decided we'd stop playing our instruments and sing "Roll Out The Barrel," during the last verse. The fact that not all of us knew the lyrics or that some of us couldn't sing them in tune didn't deter us.
Looking back, I'm glad we did that, as it was a fun surprise for our director and the guests. However, given how off-key at least half of us were, I'm also glad the moment lives on only in our memories.