I have a few that I grew up to,
If you swallow ur gum u will get clogged up ( I would tell my brothers that they would blow a bubble if they tooted
If you lie, you will get gaps between your teeth
If you drop a spoon, a fat lady is coming
If you drop a fork a man with lots of missing teeth is coming.
If a girl slept with her hair loose the witch would come count each strand and it would get gray and dry (like a witches hair)
These are all mexican things, mostly my grandma lol. I still sleep withmy hair tied up cuz I get scared