I was going to post this, but I got beat by Pants!, so may as well build on the theme, even if its obvious.
I was told by my dad not to watch, but I snuck downstairs late one night, in the dark, just in time to catch this scene.

I couldn't tell my parents I had seen it, and so everytime I had an upset stomach, gas or cramps, I would suffer in silent misery, thinking something just might burst out.....
I'll post something for everyone to guess at in a bit.