No, the 'jk' isn't the only thing that makes it clear it was a joke. The phrase "still beating hearts" is an example of ridiculous over-the-top language used fo

No, the 'jk' isn't the only thing that makes it clear it was a joke. The phrase "still beating hearts" is an example of ridiculous over-the-top language used for the effect of humour. That's sometimes how humour works, you say something and people know it's not serious, because of how ridiculous it is. For example, if someone threatened to stab you, you might think it was a credible threat. If they threatened to sacrifice you to Kali while sodomising your pet gerbil, it's probably a joke. It's more than just "some people" who joke about dark things. I would say most people make dark or sick jokes with their friends. It's normal behaviour. I find it hard to understand why you don't already know everything I'm saying. In fact it's slightly worrying that you have such a narrow (naive even) view on how "normal" people behave, and yet you feel qualified to have an opinion on the credibility of online threats.