1. If call forwarding is available at your company, forward the victims calls to an “appropriate” number (Highly moral people get dial-a-sex, bosses get dial-a-joke, boring people get time/weather, flamboyant ones get dial-a-prayer, etc). Victim may go days without figuring it out. Spouse may get interested in what’s going o at office as well. Forwarding to a VP makes for interesting reactions as well.
2. Variation on above is to get an answering machine, record an imitation of victim’s with outragous comments (busy right now with X-rated move sound track going in background, inviting all callers out on dates, denouncing whatever private beliefs they have, etc). Forward calls OR splice into phone line so only happens on occasion.
3. If someone is silly enough to put call waiting onto a line used for modems, call it EVERY time they use it. Vicitm will complain to phone compnay about “line noise”.
4. Reprogram all their speed calling to dial-a-sex, etc numbers (as appropriate for victim). Love to watch the face of someone who thinks he is calling his wife and a sexy girl comes on the line demanding a credit card so she can “talk dirty” to him…
5. If victim is out of office for an extend period (week+), answer his phone and say “Oh, Mark doesn’t work here anymore. I think that the company caught him stealing equipment/supplies/money; using drugs; sleeping on the job; sexually harrassing the boss; etc.”
6. If the phone system depends on * or # pound keys, reverse them. Most confusing. Even better, rewire 0-9 as well! Interchange only 2 keys for continuing wrong numbers.
7. Replace answering tape messages with something “more exiting”. Effects records make good backgrounds. Barmaids and dancers will often help you out on this one as well.
8. Call victim’s answering machine. Leave what sounds to be an important message and, 3 digits into the phone number, end the message.
9. If the company tracks every phone call, have everyone in the office make long distance calls from the victims phone whenever victim leaves the room. You need a spotter to keep from getting caught at this one. 900 numbers that charge
10. 50 per call are good for this.
11. One of my favorites works best in large office buildings: Stay late one night. Go through the building and forward EVERY phone to victim’s line. Be sure to do yours also to avoid being suspected.
12. If victim keeps phone numbers online and you have write access to database, scramble the numbers (Be sure not to mess with medical or other emergency numbers. You can’t play as many pranks on dead/maimed victims).
13. Turn off bell on victims phone. On AT&T phones this requires a bit of disassembly to implement but may be corrected by just adjusting the volume (there is a stop to keep bell from going off but lifting a lever permits the dial to rotate past the stop. Rotate back and no-one can tell that it was done. This is a design feature of the phones).