Now that we've established that the national do not call registry is a joke, not answering doesn't work and asking to be removed from their call list is a waste of time, I've taken a new tactic.
I tried the pervert routine, "heh, heh what are you wearing, sound like you're real pretty". Most I could get is 20 or 30 seconds.
I tried singing to them, no luck.
I tried the racist bigot. Doesn't work.
Tonight at 8:45 the phone rang; "UNKNOWN CALLER". My chance to try again

I answered with what had to be the cheesiest Asian accent you could ever imagine and they're selling home security. I rambled on for at least two minutes about "I no trust neighbor, he look scary, need home security, you have security? Me need home security now, when I get security". Never let the sales guy get a word in, "but me scared people rook at me funny". He get his supervisor on the line. "Is the John Doe?(he used my real name). "No John gone, no trust him, he go in sreep. Not wake up, no trust him, he scarry". He tried to get some words in I started rambling about need gun or big dog. Big dog must not dog in yard, something out there.
It took at least four minutes before thay hang up. I'm still laughing my ass off, wish I recorded it.