What is the hardest thing to hide after you kill a child? The boner.
Are you really trying to say that killing a child will get you sexually aroused? This upsets me greatly...
Do you even have a brain or are you just piggybacking off of other people's hard work? Yes, I'm saying that, idiot.
Killing anyone, but especially children, is an extremely serious crime and not something to be taken lightly. When people tell jokes like that, people who overhear it will think negative things about them. Think about how a child would feel if you "jokingly" threatened to kill them.
I'm not gonna let a little thing like the law come between me and my erection.
If that's so, then you may enjoy prison a lot because of your actions.... I really believe that you shouldn't act on such vile desires like killing kids and being excited over it. It might be better to try and see a therapist to sort out these disturbing thoughts.