Short version - Man in National Gaurd uniform carrying two unloaded but quite real M-16 rifles was allowed onto the field at the UM-MSU game a few weeks ago. Here's my favorite part "The university is reviewing its protocols at checkpoints to the stadium, but nobody is facing disciplinary measures".
Because hey, what could possibly have gone wrong... right?
(ps - this is absolutely, positively not intended to be a discussion of the 2nd amendment. So please don't go there.)