After discovering *71 call forwarding (It's a different code on some networks), me and my friend messed around with it a little bit, and played a prank on another friend of ours and had her calls forward to us. Then I had the idea of going up to random stranger's and asking them to borrow their phone, and making all of there calls forward to me, I just say they didn't answer and return the phone. I've only done this to 7 people on the street so far, and have had tons of fun with the callers.
I realize that the phone company could see my number when my victims call in to complain they've stopped receiving calls, so I've decided to have them stop going to me.. maybe next time I'll have them go to the bridge?