[grobdriver]

The Place: IBM Parking lot.
Woman pulls her Mercedes convertable into the lot across from me. Parks, gets out and starts to walk away.
Pauses, turns and holds out her remote. Points and pushes it with obvious effort. Looks at it, points and pushes it again.
Is apparently satisfied, turns and walks into the building having successfully locked her car.

The top was down.

[Andrewksu]

not to argue, becaue she probably didn't know, but high end cars can have proximity sensors where if a hand is place inside the vehicle, the alarm goes off.

[Hatteras]

"The top was down."

I had a '67 Convertible Mustang. Because it was a convertible, that was exactly the reason I never locked it. It had the original Delco radio and I never left anything of value in it.

Sure enough, one night, someone cut the top to get in and rummage through the glove box. The one thing missing was the gear shift knob.

[Last Visible Dog]

Looks at it, points and pushes it again. Is apparently satisfied, turns and walks into the building having successfully locked her car. The top was down.

She may have been setting the alarm. I have a convertible (Miata) with an alarm system – when the top is down I press my remove and it turns on the alarm (which includes a motion sensor so the alarm goes off if somebody jumps over the doors into the seat). This is pretty common on convertibles.