The Big Ten champion is ... 'Michigan'?

Michigan State fans who signed on to Facebook this week might have seen an ad for Big Ten championship T-shirts under the name "Sparty the Warrior."

There's just one problem. The T-shirts, made by a company called Fanbuildz, read: "Michigan 2015 Big 10 Champions."

The shirts do have a Spartans logo and the score of the Big Ten championship game -- 16-13 over Iowa.

As one might expect, the replies on Facebook aren't kind.