i employed a frustrating one until i started giving my number to potential employers...
*phone rings - goes to voicemail*
voicemail - hello?
caller - hey, this is so and so
VM - oh, hey hows it goin
caller - pretty good, I...
VM - i dont care. why dont you just shut up and leave a message.
caller - DAMMIT! (subsequent angry message)
i loved it. got my mom about 4-5 times before she began to recognize my recorded voice.