Exit Programs are done when a PC/NPC leaves the room the mobile is in. Syntax to add is: addmprog EXIT %of the times you want it to happen.

Example:
tell $n Hey! where you goin, $n?
tell $n Run away, coward!
mob gecho $n is a chicken, $n is a chicken!

Thus, when the PC leaves the room, the mob will taunt them, as well as poke fun at them globally.