In the mid 70s there was a melodeon player in East Gippsland whose false teeth were not quite a perfect fit. The local ladies would queue to have him as a partner at the Saturday night dances because, while he danced, he'd keep them in his mouth but click away on them to the rhythm of the music; in their ear, while dancing!

Better than castanets.

And he'd do it occasionally while playing dance tunes, as well.

Cheers, Rowan