My grandfather used to stick his thumb in his mouth, blow hard, and his biceps would bulge up and 'inflate' and he would say "see I have big muscles whenever I want". So I used to get caught with pins, knives etc, carving away at my thumb till it bled, trying to punch a hole right through to my bicep so I could have big muscles too. My other grandad had a finger missing and I was told that his muscle operation went wrong cause he tried to do it himself, so I stopped doing my own surgery after that...
A childhood belief about general

others believed things like this
- I thought that eating chicken gave me muscles (chicken and muscles sound the same in Mandarin).— NG
- My friend told me that if you sucked your thumb, your skin would get all mushy and your thumb would fall off.— Lauren
- my brother stopped me sucking my thumb by telling me the scissor man would come and cut it off
he was evilAnon - I used to believe that the meat you eat is turning to be your own muscles.— Yossi
- I used to believe that your thumb would come off if you sucked your thumb too much— Anonymous
- If you eat your fruits and vegetables you will grow much faster and your muscles will be very happy!— Bruno