Trying to remember which rosh yeshiva this famous story is attributed to:
Bochurim locked themselves in the rosh yeshiva's office one night to chill. The rosh had to come back to yeshiva to get something, and he knocked on his office door. The bochurim, thinking it was a friend pulling a prank, refused to open the door, until the reality sunk in that they were busted. When they finally opened the door, they were shocked to see that the rosh yeshiva had his hand covering his eyes, allowing the boys to escape without getting embarrassed.
Anyone know a source or the name of the rosh yeshiva?