This Policy Is Kwakkers
I worked in a pub that mostly catered to students. A “Kwak” is a specialty beer, to be served in a special glass with a bulbous bottom. As such, it cannot stand on its own and needs a wooden frame to be hung from.
As you can imagine, these are rather expensive and also very much loved by the students. In order to avoid the glasses disappearing like ice on a hot day, my boss required the student who ordered a Kwak to give a shoe — as they were inclined to “lose” their ID but walking home on a sock or barefoot is too big of an inconvenience… especially as it can get cold or very wet. One day, a student who was a regular, came in grinning from ear to ear and asked for his footwear behind the counter.
The owner sighed, remarked on the fact that if anyone would leave his shoe behind, it would be [Regular] and let him keep the glass.
The shoe rule remained in place but students leaving the pub had to pass a “shoe check.”