What brings on a flare? Bending over to tie your shoe...reaching for a glass on the second shelf in the cupboard...taking three swipes across the deck with a snow shovel...carrying a bag of dog food up two steps to the kitchen...seeing a quarter in the K-mart parking lot and reaching down to pick it up. Doesn't take much. Oh. And realizing you have baked a wonderful apple pie for six people and poured about a quarter cup of paprika in it instead of cinnamon. Yum...and owie.