So this may not sound like the most pleasant topic, but I've found something to be pretty much universal with everyone I talk to-- a sickness food.
For example, one year when I came home from college for Christmas, I had hash browns at Waffle House. Several hours later, I began what became a throw-up marathon of 23 times in 24 hours. It was a stomach flu for sure, and even though I didn't blame the hash browns, I couldn't help but associate them with that sick feeling. I haven't had Waffle House since, and didn't eat hash browns for years.
What foods can you not stomach, or had trouble getting back into, because of an illness or bad encounter?