Ugh, I can't stand this guy. I'm thinking of tying his hands to his feet and rolling him into the rapids.
I don't think that's a good idea. Why would you do something so dangerous like that?
I have a personal grudge against him.
That is a terrible thing to do. You shouldn't want to harm someone physically because you don't like them. You should work out your issues with this person before you end up in jail.
He has it coming.
What you're talking about doing could actually kill him. Nobody deserves that due to a silly grudge. Keep your distance from him if you can't get your problems straightened out.