If you can, tell them “Oh man, I really want to talk to you. Have one thing to do first, can you hold on?” Then put them on hold and go watch TV.
Or that. ;)
If it’s a live person, it’s more fun to make up some non-existent product and pretend to try and sell it to them.
Unfortunately, most of the Robo phone calls I have gotten from the Obama camp are pre-recorded messages I just hang up. ;-)
Better yet, put the phone on speaker setting, then turn on the TV, loudly tuned to Fox News or some conservative radio host. Or proceed to have a loud conversation with your spouse or an imaginary friend, discussing the Obama/Ayers connection, the Obama/Odinga connection, the Obama/ACORN connection, etc etc.