+Walter Hawn very clever... That's like the postal code I give to companies that ask for my postal code: H0H 0H0. They got wise to that so I switched to X0E 1C0 (search google maps ;)
Wow, I never felt humiliated, just harassed and just reply with "no, thanks". I see this like touting, or the upsell of crap at the cashier counter. Firm but polite, just cut it off.