i much prefer the Henry Rollins approach to telemarketers: briefly ask general stuff about them, then start applying obvious pick-up lines and techniques, heavy breathing included. Totally ignoring their questions and being pushy about it keeps you on the line and in control, which is hou you want to have it if you want to enjoy it. Never tried it myself, not much telemarketing action in my country, but i imagine it must be as funny as effective! And if the guy/girl goes for it, what the hell, just give bogus data...