Years ago in a certain Yeshiva, in the middle of shiur one boy took what I think was an אסימון [special coin for the telephone - I am really dating myself. It is WEIRD to date yourself... What do you say on the date?] from another boy.
As a joke, the boy from whom it was taken said loudly - "it is HEKDESH!!!"
What is the din? Is there Hekdesh Bizman Hazeh? The Rebbi in class told him that it is not Hekdesh.
Here is a deep shiur about the sugya.
