Autodialer message: "Hello this is Ann from Political Opinions. You have been carefully selected to participate in a short 30 second research survey pertaining to our nations debt crisis and for participating you will receive a free 2 day cruise for two people to the Bahamas curtesy of one of our supporters. Gratuities and a small port tax will apply. To begin the survey, please press 1 now. To decline the survey and be removed from our list press 9. Thank you."
Press '1', and walk away from your telephone. After 4 minutes of you wasting their time (and preventing them from calling their next target), they will hang up.