Speaking of debt collectors... I had one fairly incessant and belligerent collection company calling me. I forget exactly which one, but they were a known sleazy outfit that literally pushed the boundries of the FDCPA. They'd call me at all hours, usually right at dinner time or even AFTER acceptable hours (I believe 8pm is the cutoff, but they claimed 'it's not 8pm here!'), and were generally rude and obnoxious. Despite being asked to be removed from their phone list, they'd still call again several times in the same day.
So I devised a new tactic. They'd call, I'd know the number (either an 800 number or "Unknown Number" is a dead giveaway), so I'd answer the phone as an answering service. Only catch is, this particular answering service required a valid billing account or a credit card in order to BILL the caller to connect the call to the requested party. This confused and frustrated several collection agents to no end, most calls usually lasting no more than a handful of seconds - "You want me to pay for what?".
Finally, I guess they decided to assume I was playing a game with them or something and brought out their heavy hitters: Their most annoying, belligerent and downright rude - and ALWAYS foreign - agents known to mankind. Several of the next few calls they made would last 10, maybe 20 minutes, as I stood out in my garage (so my wife wouldn't be heard laughing her ass off) repeating the line "In order to connect your call to the party requested, I will need either a valid billing account or credit card number to process this call." The whole time the other party would be insisting I was the person they were looking for and to conduct whatever business they were trying to attend to, to the point where they would be swearing at me.
Much fun was had with this. Alas, this lasted only for about a week before I stopped receiving phone calls from them.