I'm going to tell a joke with my coach's mom as the punchline
Why are you going to joke about your coach's mom?
I'm feeling angry at my coach's mom. I don't like her.
Although you may find your jokes entertaining, you should be careful about sharing jokes about another person's loved one. Doing so may cause them to be upset with you as they may not find it funny.
The joke is funny and coach's mom is unreasonable. I'm going to go tell it to someone right now.
It's not nice to tell a joke with a person you know as the punchline. People might laugh, but they'll still likely think a little less of you for joking that way.