Photo: Jim Harbaugh wearing Michigan State hat

Michigan Wolverines head coach Jim Harbaugh apparently used to be a fan of the in-state rival Michigan State Spartans. In a fun photo that provided a great blast from the past, Harbaugh was spotted rocking a Michigan State hat.

Uh oh.

Here's some more gold, found some more stuff with Jim Harbaugh wearing MSU stuff! pic.twitter.com/u27ZMFyQTC

— Cassius Winston Appreciation Account (@SpartanRyan) May 25, 2015

To be fair to Harbaugh, College Spun points out that Harbaugh’s brother-in-law, Tom Crean, was a graduate assistant and assistant coach for Michigan State during the 1990s. I think we know why he was wearing that hat.

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*Featured Photo (above) credit to USA TODAY Sports