Because ORF’ing like a seal is somewhat awkward and difficult.

We’re smashing the invisible fairies that otherwise might whisk away talented people.

To show dominance over the T-Rex

To turn the light off/on

How can she slap?

Because we can’t afford to actually pay our national healthcare workers a living wage, we simply stand outside on some nights and clap together for them in unison. This gives 51% of the country warm feelies, which is much more important than actually paying these essential workers.

Those cheeks aren’t going to clap themselves

If it’s after something like a concert it’s people catching the leftover sound waves from the music in their hands so they can take them home and keep them

Converting CO² back to O² by atom smashing.

To prove our superiority in grace over sea lions, who also can clap, but not as gracefully

Because causing pain to ourselves is a sign of gratitude to those we directing the gesture towards.

Because we forget to buy condoms.

I’m actually not sure it’s a cultural universal. I mean, snapping has seen use even in some subcultures within the West. I’ve seen stomping used for a similar purpose, as well. The point is I guess just to make noise communally.

Fun fact, the kiss might not be universal depending on who you ask, either.

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To create sound waves.