My latest technique on telemarketers, especially those asking for charity donations (like Florida Highway Patrol Sympathy Fund or whatever it is) is to ask the caller how much they have personally donated to the cause. When they stutter and stammer, I politely inform them that they shouldn't call back until/unless they have given to the very important causes they are promoting. I also love finding out an ATT telemarketer (who probably lives in town here and very rarely actually works for ATT) has Sprint for his long-distance carrier, or vice-versa.
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The Unpronounceable Krsqk
"Well, sir, at the moment my left processor doesn't know what my right is doing." -
Freefall