For example. Siu get's grumpy when she's hungry.
and when she wakes up, and when someone cuts her off, and when there's no cheese in her burrito, and when the pepsi man hits on her, and when one of her *girls* hangs lower than the other, and when she doesn't get laid at least 5 times a week, and when she doesn't see her favoritest boy *Jon*, and when someone looks at her like in one of those westerns with the evil eye, and when she hears the minutest squeak on her bike, and when there's a speck of dirt on her bike, and when her furniture isn't perfectly in the correct spot, and when the moon isn't aligned a certain way with the sun 364 days a year, and when.. well you get the picture.
Me? I don't get grumpy. How about you?