I believed that whatever you did to one hand (or side of your body) that you needed to do the same thing to your other hand / side so you would "stay even." Because the side of you that didn't get the special treatment would be jealous!
I wanted people to shake both hands, not just one. And I "painted" my nails with marking pens by doing one thumb, then the other, then both index fingers, etc.
A childhood belief about general

others believed things like this
- I used to believe that if I chewed on one side of my mouth too much the other side would get jealous.Anon
- I beleived that if i bit my fingers then the nails in my stomach would soon form a hand and rip up my insides!— Amanda T.
- My mother told me that if I kept sucking my thumb I would grow another one out the side of the first one.Anon
- I used to believe that if I scratched one side of my body I had to
scratch the other to be "even".— Greg - I used to believe that if I closed one eye, the people on that side couldn't see me.— KM
- Like most kids growing up, I believed there was an upside-down word on the other side of the mirror.— Taylor (14)