Unwritten rule alert: If a baseball somehow lands in your cup of beer, you must chug it. Yeah, that ball has probably touched the hands of many players. It may also have some dirt from the diamond on it. But according to color commentator Mark Grant, if he were commissioner, that would be a requirement when such an incident occurs. Hey, if you're a tad bit grossed out by the whole thing, just think of the cool souvenir waiting for you at the end!   

[via Deadspin]

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