What are good examples of the physics of everyday life being surprising or unintuitive?
It's a bit of an open-ended question, I hope it's ok.
There are lots of posts here about black holes, expanding universes, spacetime, quantum mechanics and other complicated topics. But I can't help think that everyday stuff is also complicated, but we just think we have a good intuition because we haven't thought about it or observed it carefully.
My partner and I are in our mid-40s. I told her a fact about mirrors I learned in physics as a teenager and it blew her mind that she hadn't noticed. That is: if there's a vertical mirror in front of you, the amount of yourself that you can see in the mirror doesn't change, regardless of how far away you are. If you can't see your feet, you still won't be able to see them if you walk closer or further away (assuming your eyes stay at the same height).
There's a famous one from Galileo: ignoring wind resistance a heavy object and a light object fall at the same speed.
What are other good examples?