When I was young I used to believe that when I got an erection, that meant I had to pee. I thought that pee filled up the wanker making it hard!
A childhood belief about weeing and pooing

others believed things like this
- I used to believe whenever I got an erection it meant I had to pee.— Adam
- I used to believe that as I ate food, I filled up, and that once I filled up completely, I would die. Anon
- I used to believe that when people eloped that meant they were making babies...Anon
- I used to believe making a cake from scratch meant using a box mix rather than buying a cake from the store.— EZ
- I used to think that a company had boats all over the world making waves, and airplanes making cloudsAnon
- When I was young, I really used to believe that 'R.I.P.' (on a gravestone) meant 'Return If Possible.'— Colin