"Oh, no!" you exclaim, "I didn't realize!" You hold out your own car keys, saying, "here, take mine; it's clearly much more important that you, a stranger, should have a car than for me to have it."
He snatches the keys from your outstretched hand and says, "Wow, thanks! Now how about those breadsticks?"
You ignore him, as you're sufficiently over the pizza tangent, and make egress. But how will you get home, now that you don't have a car?