I was with an acquaintance exhibiting behavior a little odd for him but normal enough over all.  Turns out that he committed murder later in the day.  I still do not know if he was distracted over planning the murder or his behavior was caused by disturbances leading to random murder.  Sometimes it seems any loot is merely an excuse to commit murder.
It does take a certain amount of derangement to kill other men without being in a war zone.
907girl, I have a cousin in the mental lockup for murder, our family quit allowing visits when he was six an got caught killing neighborhood pets.  The signs are there if anyone looks.