looking for a motive

SOMEONE must have been PISSED. i saw the remains of a telephone book on the parking lot pavement today. it seemed like such a random item to lose/throw out a window of a car(?) and if it was disposed of due to its dilapidated state, how did that happen? i can’t imagine someone using the phonebook SO MUCH that it gets all crappy, unless you’re really short, and sit on it a lot at the dinner table. but even so, why throw it out…you need that.
i’m sure it was just a grad student relationship gone bad as the guy angrily stomps out of the apartment with his girlfriend yelling after him “AND TAKE YOUR STUPID PHONEBOOK, TOO!” of course, he gets the last laugh. he left it to decay.