I can see having fun with this as long as none knows you can personalize voice messages for them...
Girlfriend calls:
"Hello, (girl talking in background) quiet my girlfriend is on the phone!... hello... hold on... do you want her to find out?!..."
Friend calls:
"Uhh yeah, this is AfroBacon leave your message after the beep; oh and Rick if your hearing this, nice job with that stripper last weekend, you should really get yourself checked. Oh and don't worry about me telling your girlfriend, my lip are sealed."