Thought this one might tickle those who like to hear of the rambling lack of logic in the currently applied security process....
UK group of airports
Staff from one of the group are attending a course at the "main base".
The course is airside.
Security tell them that passes from other airports in the group are not interchangeable for other sites and so they must get a visitor pass.
When collecting their visitor passes they are told they cannot use their "other group airport passes" as proof of identity ... they must bring passports etc.
When being issued with their temporary passes they are then told they must hand over their "other airport pass".
When they quite naturally ask why they are told ......
"Because you can't hold two passes at the same time"