The Foundation for Individual Rights in Education (FIRE) has produced a fascinating video about a Wisconsin theater professor who was accused of promoting violence and creating hostile environment by putting up a poster with a quote from the TV series Firefly.
After campus police took down his Firefly poster, Prof. James Miller then put up a poster condemning fascism and police violence that got him cited a second time. Miller ended up getting substantial support in his case from FIRE, fans of Firefly, author Neil Gaiman, and Firefly actors Nathan Fillion and Adam Baldwin. A great look at how a campus free-speech case played out. (Hat tip to Boing Boing for the tweet pointing this out.)
The libertarian blog/magazine Reason had a good article about the case back in September as well.