2 geeky things I did back in 4th year

I'm trying to make a record of all the geeky things I've done. Here are two from my last year of university life:

1. one day I was taking some vitamin, I saw "38 MM" engraved on the inside of the cap. Without hesitation, I took out my ruler. Indeed, the diameter of the cap was 38mm.

2. I found out that muscles are weaker against torsion...because it is easier to twist the iron ring off my finger instead of pulling it off.