My BIL is getting credit card marketing calls all the time. He makes a genuine sport out of keeping them on the line as long as he can. I don't know how the guy can keep talking to them without cracking up, I roll on the floor listening to his end of the conversation.
His end usually consists of him telling the telemarketer all about his family, about how he just got out of jail, has no job but makes a little by robbing banks so he could probably pay the CC bill, how all the women in the family are prostitutes so they can help. He has a complete alter-identity made up so he can take the tm's through the entire application process using fake data.
Sometimes he uses his very thick fake Norwegian accent and drops in a few Norwegian words here and there.
It's just a hoot.
But here's the funniest one I've ever heard:
http://www.boreme.com/boreme/funny-2...r-prank-p1.php