I am usually a mellow individual, but there are times, and it can appear very suddenly, when I just have extremely violent, intrusive thoughts, often helped if they are triggered by some irritability.  
Now of course, at the tender age of 22, which is where I sit, one's testosterone is at its peak level, and can of course contribute to say aggression. But I do get some severely violent intentions at times.  
The other day I was walking in the street and another rather rough-looking guy (about my age), deliberately barged into me, and whilst I continued walking on, a wave of extreme, bitter violent anger engulfed me and for the next 10 mins, the only thing I could think of was beating him to a pulp and stomping his skull to mush on a curbside.   
No joking it took me 10 mins for that to completely leave my head and thinking about it occasionally now, that moment still irritates me, and brings up these physical thoughts in my head.  
Not my finest trait I must admit, and it does seem to be severe, but this is probs part of a wider manifestation of having an extremely short, shitty temper, that runs rampant in my family tree on my dad's side.   
Just thought I would leave it all out there, as to why one's thoughts are so explicit?