Grading papers reminds me that I experience mild dissapointments about ten times as often as pleasant surprises, which leads me to think either that despite my overcast disposition I am actually an optimist or that the universe is cruel.
On the other hand, the effects of eating undercooked beans - I got impatient while making chili last night - lead me to think Pythagoras was correct in forbidding his followers to eat them (though it's thought that his injunction "Abstain from beans" actually
refers to abstaining from politics).