You know, like at a play or musical presentation when everyone starts clapping along out of nowhere.
I know of a couple double offenders that not only love to clap along BUT in fact start the clapping.
(Ahem MM and WWAMD's dad)
Except under one condition: the performer encourages it (such as Justin Beiber or Michael Buble)
I'd rather just withstand the stares of the people around looking at me as if to say "if you're not clapping along your obviously not enjoying yourself."
No, I was enjoying myself just fine until everyone started clapping along.