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Block M on Michigan's campus painted green with an 'S' and 'U' added on (Photo)

Well, this is an effective way to make sure Michigan knows that Saturday's opponent is Michigan State.

Someone painted the block M on Michigan's campus green on Tuesday night and added an "SU" in white next to it. We don't need to explain what the three letters mean.

The block M was donated to the then-university president by the class of 1953. According to Michigan legend, if you step on the M, you'll fail your first blue book exam. No word what the punishment is for painting the letter.

The Spartans are 17-point favorites for the game in East Lansing, Mich., at 3:30 p.m. ET Saturday. And it's not the only rivalry game this weekend that has a recent history of vandalism. Last year, someone posted an Alabama message on Tennessee's "The Rock."

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Nick Bromberg is the assistant editor of Dr. Saturday on Yahoo Sports. Have a tip? Email him at nickbromberg@yahoo.com or follow him on Twitter!