For some reason bottle caps remind me of these dorky hats the adults wore up at the lake. They were of knitted squares sewed together with alternate color yarn.

Wait...upon further thinking of this I think the hats were made from beer cans and sewed together with yarn. Soda cans too. I have to go google this the memories are teasing me.

Yes, it was a thing! Crochet hats with the aluminum cans. I think it was a vacation thing tho.