Escalating Conversations with Roommates

"Did you get a Banff park pass?"
"Yes. It's in the car if you want to borrow it. You know where the spare key is."
"Thanks, I feel the need for a road trip."
"Oh, and I mean you can borrow the pass, not my car."
"I have my own car. Otherwise I wouldn't be able to shuffle the bodies away from the house."
"Just so long as you don't go sullying my car with all that forensic evidence."
"Well, not since the last time. Oh, er... never mind."
"Meh. I got the car detailed last month. It's all good."