A fart comes before the storm - A loud, smelly hint that if you don't fart first, you'll be

A loud, smelly hint that if you don't fart first, you'll be stuck with a big poop and no escape.

I told my sister this before she ate the last pizza slice.

My dad said it to me when I pooped on the floor.

My friend used it when I couldn’t stop laughing during math class.