Growing up my mum always used to tell us that if you left your slipper or shoe upside down it would mean you're calling Shaytan into the house and as a kid I always believed it because your mum wouldn't tell you something that is wrong, right. But as I got older I got older, I realised there's nothing that says this is the case and is just superstition. Astarghfirullah. May Allah forgive my mum.
There are others I've also heard like hoovering after maghrib is bad too. But again it's just superstition.
I just wondered if there were any superstitions that you grew up with believing to be part of Islam but actually isn't.