For several months I had a sharp pain in my chest and I worried that i was developing some sort of heart trouble.

Then one day I realized that my friend and I have this inside joke where we clap our hands really rapidly ehenever we do something exciting or get excited about an idea like visiting a great restaurant or something.

So I stopped doing the excited clap for a few days and the heart pain went away, hahaha.

I was probably repeatedly straining a muscle by rapid-clapping like a madman all the time.

I still laugh at myself sometimes when I think about it. it only happened about a year ago.