I used to believe that if you held on to your wee/pee whatever its called, then you would pee for as long as it took you hold on.
A childhood belief about weeing and pooing

others believed things like this
- i thought that if you held in your fart you burp if you happen to hold both in you explode!— ahh!
- I used to believe that if you had to fart and held it in too long that it would cause you to blow upAnon
- I used to believe that if you held a fart in long enough it would come out as a burp.— Chris
- I used to think a female daddy-long-legs was called a "mummy-long-legs".Anon
- If you hold your breath and make a wish under a highway tunnel it will come true....I still hold my breath :)— aj
- When I was young I used to think my testicles held the pee!Anon