Evil thoughts.

[CapnAwesome]

I think there is a radiolab episode about this, where some shockingly high percentage of people (65% maybe?) have had very specific fantasies about killing people. So it could be fairly common. Sometimes I think my dark side is worse than other peoples, but it's really hard to tell.

So it could be that maybe nothing is to be done about what you are thinking about and it could be normal. However if you are having frequent thoughts of suicide I would say that's a different matter entirely and you should talk to a professional