http://mdgdxj5d7wlgq3m6e4fvca5sgnbvejsyjh3sqh3p3tfngcnrhpuy3aid.onion/2013/greetings.html
If you have five more fingers and a palm involved, you can turn that into a clap. Clap and slap have the same number letters and almost the same ones, but mean different things. A clap is a slap to your other hand that you repeat to make noise and cause both to hurt.