What sayings or superstitions seem to make the less sense?

I know many of you are going to say all of them.
But walking under a ladder is bad luck. I can see why. You may knock someone down.
Don’t let a black cat cross your path. I can understand how in the old days when things were lit by candle, you can accidently bump into a black cat in the night and it can spook you or you spook it and piss it off.
But things like. If your right hand itches than that means money is coming your way. Personally I would think it just means your likely to spend more money and the thought of it causes you react.
Where do you think there may be some situations to some of them that would make some sense?
Like the first two examples I gave.