Just washing my face and remembered that when I was young my mum used to say that if I didn't wash properly, I'd get a tidemark around my neck and people would know.
A friend's mum wouldn't let her go outside if she'd washed her hair that day as she'd catch a chill - even when her hair had dried!
Still don't stick my tongue out in case the wind changes and I stay like it 
Anyone else have any weird ones?