I've done that one about pretending to be the answering machine. Whoever it was hung up on me.Also I've done the answering machine recording where you say, "Hello? Hello? I'm sorry, I can't hear you. Can you speak a little louder? PLease leave a message blahblahblah......" That was when I was in college and my friend who called me started his message with the word "Bitch." ;-)