have you ever made/received them? my brother and i used to love prank calling people, once he called someone up and farted down the phone. good times.
anyway, i just received one at work:
me: good afternoon big life?
person: hello, i'm calling from your fridge company. sorry to bother you, but is your fridge running?
me: i would imagine so, yes.
person: THEN YOU'D BETTER GO CATCH IT!!!! *hang up*

not the finest i've heard but certainly brightened up my day. tell me about yours, sent or received.