IIRC McDonalds still does this for some subset of its corporate workforce.
My first McJob was at an owner-operated McDonalds where the owner would roll in at lunch on a Saturday in his BMW Z4, see the lunch rush, wash his hands, throw on some gloves, and call out to turn on the other side of the grill for assembly and start packing orders himself on that side to help out the workload.
Gained a lot of respect as an impressionable young adult on what a good leader looks like at that job because his efforts trickled down to his store manager and the managers underneath them.
The worst thing was that Ray Kroc's wife live in the next town over and routinely came through our drive thru. Once the lot was being re-surfaced and she was royally pissed that the drive thru was closed and she had to come inside and mingle with the hoi polloi.