Anybody ever ponder unlocking the door and when he/she is just about there...open the door hard and fast giving them a good smack?
"OOPS! My bad. You OK?"...SMACK..."Darn, I slipped a little in some oil right there, watch your step."....SMACK..."Gosh, caught my shirt on the latch, that's gonna leave a stain. You sure you're OK?"....SMACK...
Make sure the door is locked, start dialing 911, and let him see you calling.
He touches the door handle or, well, the vehicle at all, I may draw and keep it low ready, still on hold with 911.