I have a strange urge to elbow a person's foot.
Why do you want to elbow a person's foot?
He won't stop talking about his dad's death
It's rude to hit other people especially when they are grieving. If you can't stand what they are saying you should walk away from them.
I'm going to use violence then.
I can understand him being a bit annoying, but causing harm to him is going to fix anything. Instead of using violence, just talk to him about how you are not interested in hearing about his dad's death.