The jumping timing belt

I found my old timing belt in the trunk with over 200lbs of other stuff (all in my droopy 2wd sedan). Upon closer look and remembering the worst engine trouble I had , was a belt that skipped a tooth. I had just got the car and had to drive it for over 650 miles , without much trouble, except engine louder than normal. What would 1 timing belt across the whole thing have done in the same scenario? I don't even want to think about it...