My crazy munchkin knows the sound of my car doors locking. He can hear the noise from inside of our apartment when I lock the car in the parking lot. And then he starts barking excitedly.
When he's feeling especially hyper, he'll start carrying around my stuff (like my shoes, papers...things he normally leaves alone) to see if I'll trade him my things for a treat.
He's obsessed with writing utensils. Steals any pen, pencil, highlighter he can finds and runs and hides with them. We say he's working on his memoir.
He lifts his arms for me to put clothing on him. This never fails to make me laugh. He also steps into his harness for me.
He prefers to ride on the arm of his car seat rather than IN his car see. See picture below.