Animals don't have negative thoughts; they're out there having the time of their lives, swinging from branches, mating with nearly everyone who comes up behind them. And us? We ruminate on things, worry, regret, resent; who picked the short straw, do you think? Most awful of all is that we can project to the future and figure out that we will eventually lose our looks and dare I say it ... die.
Ruby Wax: Sane New World