Bahh, this may not be gross for most people, but me being a huge germaphobe, I wanted to die. I once ate cereal out of a dirty bowl from our dishwasher, and only after I finished did my parents tell me the dishwasher wasn't clean. I'm so paranoid about dirty dishes and check dishes, cups, and silverware where ever I eat (including restaurants). -shudder-
Another time I found a huuuuge silverfish on my computer desk. It was sooo nasty and I still freakout because they've been on my desk before. Sometimes I find bugs (both alive and dead) in the baskets I store my socks and underwear in in