Clapping is onamatapaeic,
one hand clapping sounds like clapping.
( Master Of Turnips. Only gays and morons believe in ghosts., Tue 26 Aug 2008, 18:40, archived)

how about
in Chinese?
( Moon Girl Technologies horrendous beanbag, Tue 26 Aug 2008, 18:48, archived)

They probably don't use an onamatapaeic word for it,
so the proverb might hold up to the scrutiny.
( Master Of Turnips. Only gays and morons believe in ghosts., Tue 26 Aug 2008, 18:49, archived)

The sound of one hand crapping?

( Malaka omdz, Tue 26 Aug 2008, 18:51, archived)