"What is that?" they ask.
Me: My car is working again, but it has been re-tired.
Thing 1 groans loudly at me. I protest - what was wrong with that?
Thing 1: C'mon, dad, that pun was groan-worthy.
Me: Oh, so it's an adult?
Thing 1: What?
Me: It's groan up!
He bopped me on the head with the plastic lid, then went to tell his brother about it.