I thought that you could capture a fart in a jar - Sound and all. The procedure was that you fart in the jar and put the lid on as quickly as possible. A fart in a jar could last as long as a week. As the week went by the fart degraded
A childhood belief about farting

others believed things like this
- 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 believe if you fart hard enough you can fly— Bob
- i was scared to fart outside in cold weather because i thought u would be able to see the steam.— xJeNneSceNcEx
- When I first met my husband, he thought women didn't fart. He was really surprised after he met me!!!Anon
- I used to believe that when you fart, your tummy was breathing!— Nicholas Orsmond