If you don't know the difference between video games and real life, then you've got a BIG problem. Please go see a counselor/shrink/therapist/person with common sense ASAP.

I don't know if you're serious or if you're just a troll, but seriously, this isn't something to joke about. You should never kill anyone, unless it's self-defense. Video games where you kill people "like crazy" aren't even close to reality! It's flabbergasting to even compare a video game to real life. Just know that you should NEVER kill anyone (unless in self-defense).