Someone recently threatened to put me in intensive care due to a joke I made recently. The funny thing is, I was about to delete the joke on Facebook just before the threat came. Not because I thought it would offend people but because I didn't find it as funny as I thought it was when I first posted it. However, when I got the threat I defended that joke like it was the funniest fucking thing in the world, just because I had a point to make.
Everything should be laughed at. If you don't laugh at something, it becomes scarier and bigger than it should be. But yeah, there's lines you shouldn't cross and I learnt that from experience (not the thing I just told you about. Fuck that, violence shouldn't stop you making jokes). I told a rape joke to a rape victim. Not on purpose, it was a heat of the moment thing but it helped me realise that if a joke is going to really hurt someone, don't fucking tell it. But, most of all, a joke has to be funny enough to excuse the offence you might cause. So, telling a joke is all about timing and understanding your audience.
As for that image, it's funny in certain circles. I can see myself laughing like crazy with my friends at a bar after a few beers and, while sober, I can appreciate the thought that went into it but it's not very funny.