I used to - and kind of still do - believe that if you hold back your sneezes, your head would explode.
I hold back my sneezes... dundundun...
A childhood belief about general

others believed things like this
- My dad always told me to never hold my sneeze and if I did, then my head will explode.— anon.
- that sneezes were caused by little pixies crawling up your nose and brushing past your nose hairs— Joanna
- i thought that if you held in your fart you burp if you happen to hold both in you explode!— ahh!
- 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 a little kid. i used to think that when u hold ur breath ur heart stops.. LOL :P — Annonymus
- I used to believe that it was the law to hold the railing when you're walking down/up stairs— Brit