In my criminal class, my professor started going into an aside about how evil and dehumanizing rape jokes were. I found it kind of refreshing she focused on how men were usually much more likely to be victims, and it was kinda nice... until she started putting up pictures of rape jokes.
The first one was a girl tied up, with the caption "Don't struggle, let's not turn this rape into a murder". Now, that way hilarious, but I only snickered. However, the next joke referenced the amazing Irish crime show Love/Hate. One of the characters gets raped with a pool cue, and the picture was him, with the caption "Fancy a game of pool? I do in my hole". At this point, I broke into laughter, and had to get glared at my the professor before I stopped.
Fucking hilarious, though.