I believed that a giant cartoon-like skunk tail, black with stripe, would pop out your butt when you farted, and go back in before you could see it, which explained the "pop" feeling that comes with a fart.
A childhood belief about farting

others believed things like this
- I used to believe that if you farted really hard, you could fart a hole in your pants. How dumb was that?— stargirl
- I used to believe that a cat's butt hole was on the tip of his tail.— PANTS
- When you farted, green air came out of your butt— Yvonne
- My mom used to tell me that if I swallowed my gum when I farted, I would blow a bubble out of my butt.— bubblebutt
- I used to believe that if you swallowed chewing gum, when you farted, you would blow a bubble out your butt.— Bubble Butt
- i used to belive if you swallowed gum and then farted, you would blow a gum bubble with your butt.Anon