So it wasn't some die-hard Michigan fan or alumni who paid for a skywriter to fly over Spartan Stadium and write "Go Blue" after all.
It was the University of Michigan.
Oregon Aero SkyDancer skywriting told MLive.com that the Michigan athletic department paid for Wolverines' slogans to be placed over Ann Arbor and East Lansing on Saturday. The rival Spartans were playing at home against Youngstown State.
"We hired the skywriters to canvas southeast Michigan with slogans and numbers prior to our game last Saturday," Michigan athletic department spokesman Dave Ablauf said in a statement. "There were no locations targeted ..."
Suzanne Asbury-Oliver, who runs Oregon Aero SkyDancer, did not disclose to MLive.com how much the job cost. She also said that she didn't think the request was out of the ordinary.
"He gave me his wish list of what he wanted done," she told MLive.com. "We just did what we were hired to do.
"He asked me not to say how much it cost if I got questions about it."
Interesting note to that point: UM athletics "are funded independent of taxpayer dollars," MLive.com reported.
In response to the skywriting prank, the executive director of the MSU alumni association challenged Spartan fans to raise $3,000 -- his estimated cost for the skywriting -- for Ovarian Cancer Awareness Month. They responded and have donated around $27,000, MLive.com reported.