It's rude to wish for someone's death
A stranger side swiped Brad's car, and they both got out to argue.
Brad wants to end the argument.
Brad lets the stranger know that it's not that big of a deal.
Brad tells the stranger that he hopes he never breathes again.
The stranger is able to relax and is glad that Brad isn't that mad.
The stranger's feelings are hurt, and they feel even more guilty.