Not speaking of the wet, gross nasties that might come out when you catch a cold. I'm speaking of food items which took a wrong turn from your mouth - up instead of down - due to a sneeze or sudden spell of laughter. Darkfinn's reply on the "What's Worse Than" thread stirred up an old memory.
Worse for me was eating french fries and having someone say something that triggered a hard laughing spell. Half of a french fry got sucked up into my sinus area far enough that no amount of swallowing would draw it back down. There was only one way it was coming out and that was to blow it out! It took a few good, hard blows, but it finally shot out my nose burning all the way from the salt mixed with it.