The no swimming rule had a reason; you might get a cramp and drown. Thanks to this thread, I looked up if that’s true. It turns out it is just a myth. I’m embarrassed. I didn’t let my kids go swimming right after eating, either. I perpetuated the lie!
I can’t think of other rules that don’t make sense, just lots of superstititions my family believed. I now know they are not real, that it is magical thinking, yet still I don’t want to take any chances by walking under a ladder…