I have a hypersensitive gag reflex, which can be triggered by nothing more than holding a pencil in my mouth, for example. Brushing my teeth is an ordeal, and I've actually had to throw up because I was brushing a little too energetically. A visit to the dentist is a nightmare, because although she's aware of the situation -- it is a genuine condition, though "condition" is a little strong when there's nothing but one symptom -- there's not a damn thing she can do about it.
Still, it could be worse: I could have been born a woman or a gay man, KWIM.
Sorry this confession is not all that shameful. I resolve to do better in 2008.