These people annoy the hell out of me. I am fucking 16 and I have had 4 telemarketers in the last week. The funnest thing you can do though is go off in a different language on them...i.e. I went off on an American Airlines telemarketer in spanish. It was a wonderful feeling. Or if you don't know another language strike up a conversation with them. Ask them if they actually enjoy their job. They are going to call no matter what you say so why not make the best of it.
I find everything ammusing.
'Executing this trick perfectly will get you more tail than Axl Rose at the Pontiac Silverdome'
'I am Gay'