3/16 Driving Backwards

Had my oil changed at University Place Tire Center
My son, his friend and I watched the oil get changed.
The boys loved it.

We were already in the car and leaving when the worker flagged me down and needed to check one more thing. He lifted the hood and I turned around to help the boys click their seat belts. When I turned back around we were in the middle of the parking lot??? 
I was so confused.
Turns out I didn't put the car into park, just reverse and while I was helping the boys, we slowly rolled around the lot ~ the entire time the worker stayed with the car and kept fixing whatever it was that needed fixing. 
Yep, I felt a little silly, but glad we didn't run into anything or anyone.
Ever not know where you were going?