I'LL PAY YOU BACK - A lie you tell when you're too broke, too busy, or too dumb

A lie you tell when you're too broke, too busy, or too dumb to pay them back.

I'll pay you back... when I'm rich and you're begging me for a dollar.

I'll pay you back... after I eat all your food and borrow your phone.

I'll pay you back... when I'm not broke, busy, or dumb anymore.