Tell about a time when you were a jerk :P but, it was funny.
i'll start:
i used to work at a videostore. at my store, if you hadnt rented at our location before but had at another, we had to call to do a customer check and xfer your account (this was in the stone-ages, clearly).
we used to have a guy in our system whose last name was "mahboob." the location down the street a bit also had him in their system. so we'd call just for fun:
"videostore X, can i help you?"
"hey, location X? this is location Y. i have a customer check."
"ok, name or number?"
"number."
"what is it?"
"Account number 12345678."
".........mah...boob?"
"AHAHAHA"
"DAMNIT LOCATION Y."
"ahahahah *click*"