The Mirror Lake dip is a tradition before the big Michigan vs. Ohio State rivarly game. Students strip down and jump into the water, in usually absurdly freezing temperatures, because remember that Ohio State is in well....Ohio. 

It's not like the Buckeyes are going to need any good luck to beat the Wolverines this season, who are having their worst season in over a hundred years, but hey, can't break tradition right?

See more ridiculous half-naked college stuff like this here and here.