What is the weirdest argument you’ve overheard?

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.