There is a room that is possible to glitch into and impossible to leave.
One way to get in is if a friend or zombie pushes you into the room. Another way to enter is at the NWAF where you run inbetween the lockers and you glitch through.
See this youtube video, the room looks like the one at the 15 second mark. However at the NWAF, it is located on the second floor with the two lockers.
As you are unable to respawn, you are stuck in that room until you very very slowly die of thirst and hunger.