Telemarketer Games:
1) Insist you cannot get cable, because that's how they see you. (Yes, I've done this. We now seem to be off Rogers call list.)
2) Tell them you know it's Vanessa and not at all from Sprint, that the baby doesn't even look like him and why can't she just leave you alone?? (bonus points for sobbing, then hang up. Yes I've done this too.)
3) Beg them for the antidote. Insist you've held up your end of the bargain, and that they're a govt agent.
4) Sing. Invite them to join in on the chorus.
5) Ask them to hold, then put the phone down and walk away. Kind of mean because most systems won't let them terminate the call, resort to only if they're rude. If you have anything with a porn soundtrack, it's a good time to play that loud so they get a creepy visual.
6) Tell them about Jesus. Either the god made flesh or your pet fish. Mix it up a bit.

Any others?