This post comes from Lynn Mucken at MSN Money.

He must be the Lex Luthor of credit card manipulation, a genius gone wrong. Like Superman's archenemy, he has decided to use his immense powers in perverted ways.

On CreditCardForum.com, poster "CreditCardGuru" begins by promising -- innocently enough -- to show you how to score free drinks from Starbucks, whose products are described as his guilty but overpriced pleasure.

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And he delivers, taking you on a compelling journey that begins with maxing out the 5% cash rewards from the Discover More card, then redeeming them through a Starbucks gift card that gives you $50 for every $45 in Discover dollars ("that's an 11.11% boost in value," he exclaims). 

Next, the $50 is loaded onto an old Starbucks Rewards card that has achieved "gold" status by being used to buy 30 or more drinks. The payback here: free syrup and milk options. And every 15 drinks purchased on the gold card earns you a free one. 

CreditCardGuru, his money-saver's heart still pure at this point, details how you can, by building your own using the free syrup and milk options, get a "ghetto latte" costing $2.30 that's identical to the $4.65 Grande Café Latte. Post continues after video.

Here he goes serious off track, fantasizing on just how expensive a creation he could get for free. "I knew I could do better," he rationalizes.

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So he clogs up the line at the Starbucks on Highland in Hollywood -- I've been there. Not a wise thing to do; the customers tend to be a bit edgy -- and orders this: One pump of every single syrup available, extra caramel sauce, soy and 22 extra shots (24 total) of espresso containing the same amount of caffeine that's in 22½ cans of Red Bull.

A $20.65 drink -- free! Check here to see the receipt.

How did it taste? CreditCardGuru sniffed it -- "smelled like burnt pine cone" -- and tossed it into the trash. He had come to the brink and stopped. This time.