I splash the below powerpoint up on the first day of every class. I patterned it after the TV ratings.
This is my effort to coax the students into a mature response when we discuss media matters. Gay marriage amendments should not bring about giggles nor should a congressmen texting photos of his penis. (okay, maybe a few giggles allowed there). But, as I reflect on my teaching methods, I think I use this slide as an excuse for when I swear so much in class… “I told you there would be mature language.”
Adventures of a politically incorrect adjunct 
I don’t remember if you ever warned us about mature content in any of the classes I was in–certainly never like this. I think it’s a good way to start off, though.