How Much Would It Take for You to Lick an Entire Subway Railing?

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This kid did it for $1; obviously, the stunt was less about the money and more about impressing his friends and getting attention. But, for the sake of discussion, how much would it take for you to lick a subway railing from top to bottom? It's disgusting, and you may end up with more diseases than Mr. Burns, but everyone has a price.