If specific people existed when they where right in front of them existing. Those people are LGBT people and it’s happening to much.

Not an argument but I once heard my neighbor casually (but loudly) discuss with someone how she could only orgasm anally

I got involved in a argument between two older people about whether the earth rotated or not.

The very strange thing is that after I confirmed to them that the earth did indeed rotate and that is why the sun would rise in the east and set in the west, that was the end of the conversation and they thanked me and moved on.

Not one I overheard but one were I was overheard. In Paris at a restaurant where my girlfriend and I (anglophones) commented on the couples baby beside us. She said it was such a cute baby. I countered the most babies are cute so it should go without saying. You really only have to comment when they are butt ugly like in Seinfeld. It was a fun discussion which made us both laugh. Mid meal the couple got up and said in English that they enjoyed it too.