I experience this hijacking. I go off on a tangent, then awile later I question why I got set off. Mostly it is disrespect or selfishness on another persons part (or a perception of such) that gets me riled up. I never physically strike out, but my command of the english language can be used as quite a hurtful weapon, to my chagrin. Pot helps, but now I live where it is currently illegal so...