Last year, during construction of the new Yankee stadium, a Boston fan secreted a Red Sox Jersey into some concrete (it was dug up after some other workers spilled the beans). No it seems that a Yankees fan tried something similar at Fenway:

Ian Ferris, 30, a Bombers fan in the heart of Red Sox Nation, green-thumbed his nose at Boston by planting Yankee Stadium grass in the Fenway infield during a May 31 Phish concert.

Heck, I didn't even know there was such a thing as Yankee Stadium grass seed :)

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