I was scared to fart outdoors in the winter when I was a kid (OK, I'm still a little self-conscious about it). When you are in the cold you can see your breath and steam comes out of your mouth. I figured the same principle applies to flatulence. How embarrassing would it be to fart outdoors in the cold and have someone see steam coming out of your butt and know that you farted?
A childhood belief about farting

others believed things like this
- i was scared to fart outside in cold weather because i thought u would be able to see the steam.— xJeNneSceNcEx
- I used to believe that if you farted really hard, you could fart a hole in your pants. How dumb was that?— stargirl
- When I was a child I used to believe that the steam rising from my food were ghosts. Anon
- I thought a "cold sore" on your mouth was the same thing as "coleslaw" and so avoided eating it for years.— Helen (UK)
- I used to think the clouds were made of the steam that comes out of the factory smoke stacks.— TJ
- I used to believe if you fart hard enough you can fly— Bob