What is the sound of one hand clapping?

I take attendance by asking the students a question.

What is the sound of one hand clapping? (previously: 2017 2016)

• tap?
• skrrt
• snap
• ∅
• slap
• crakc!
• yes
• uwu
• whoosh
• a hand puppet
• nothingness
• the sound of silence
• emptiness
• category mistake
• nothing sadness (2 votes)
• no sound
• owo
• a snap?
• uwu

This post's theme word is potch (v tr), "to slap or spank," or (n) "a slap or spanking." A solo potch is silent patter?