I once told a friend of mine that if you held in a smelly burp, it'd turn into a fart. She believed me.
A childhood belief about farting

others believed things like this
- I used to believe that if you held a fart in long enough it would come out as a burp.— Chris
- i thought that if you held in your fart you burp if you happen to hold both in you explode!— ahh!
- My brother once told me that if you burp and fart at the same time, you'd explode— Aubrey
- I was told in first grade that if you fart burp and sneeze at the same time you would blow up— bob doodle
- My friend's sister believed the lyrics to Gazza's "Fog on the Tyne" were "Fog on the dinasaurs mine all mine"— Suzanne
- I used to believe that if you had to fart and held it in too long that it would cause you to blow upAnon