--to last week's stochastic, but I was just re-reading the def. and was struck with inspiration (or something) when I saw the word probabilistic. I was reminded of that contest (by the Washington Post?) where people submit "words" made up to fit funny definitions. And I thought that a word for someone who's likely to lose his temper easily would be probaballistic.
It's quite probable that I actually saw this word somewhere; and if someone points that out, I promise I won't go ballistic.