I do the same thing that I do when those people who want to talk about their religion come to my door. I pretend I'm a Satanist, sound very interested in what they're saying,a nd all the whiel just shout fromt ime to time to "keep the ***** quiet, cutting the baby out of her gut cant possibly hurt that much" or "I'm sorry, can you excuse me for a second, I seem to be needed for my spot in the summoning pentagram, i'll be right back".
usually i nver hear from them again, but I almost always get a cop visit in search of some bodies.
or i'll just record a telemarketer's call from before and when they start talking, I start playing mine.