My favorite thing is when I have two friends who have never met each other.
I tell them both "hey, I want you to meet my friend. He's hard at hearing though so you need to speak up. Like REALLY speak up, like almost shouting."
It usually takes them about 5 minutes to realize the other person can hear just fine, and that I'm just a jerk.
This isn't a dad joke just something funny I do lol