When I was young I had cousins in New Jersey and they would jack with us any chance they got.
I was told that if you go into the bathroom and turn off the lights(pitch black), spin around 3 times while saying "New Jersey devil", then look in the mirror you would see the New Jersey devil.
It's still kinda scary to do
A childhood belief about monsters

others believed things like this
- Grandmother told me if I whistled in the bathroom the devil would come get me because I was whistling for him.— Peanut @ Lake Tawakoni Tx
- I believed that if I looked too long in the mirror admiring myself the Devil would appear.— Paul Elletson
- If you stare into a mirror in almost complete darkness, the devil will appear instead of your reflection.Anon
- My mum told me that if you eat while you're on the toilet, you're feeding the devil! — Claire
- My sisters told me, and I still believe, that the 'Hokey Pokey' is the Devil's song.— You shake it all about...
- I was told that if you dropped food on the floor, the devil kissed it. — Teresa