366: Any food or other perishables rots ten times as fast when near you. Of course, this does not apply to things that don't generally rot, such as stuff in packets, or honey.
367: Your teeth fall out when you yawn.
368: You gain a hindbrain, capable of fighting, moving and avoiding basic and obvious danger (massive predators, yes, loud noises, yes, radiation warnings, no) when your main brain is unconscious, drugged, asleep, or otherwise can't handle your body.
369: You can create illusions, visible to other people, but whenever one is active, your sight will be reduced or lost.
370: Your hearing becomes sensitive enough for you to navigate by echolocation, by whistling. So incredibly sensitive.
371: You need eighteen hours of sleep.
372: Your hands shake wildly and uncontrollably, when awake.
373: Your spine splits at the neck into two weaker spines, joining again at the pelvis. If one is damaged, the nervous system of that side of the body will be harmed, but not that of the other side.
374: All your hair falls out, and you grow disfiguring scars across your face and torso.
375: Any child you have will only have your genes, not that of the other parent. No other visible effects.
376: Your vocabulary is reduced to the most simple five hundred words of English, or whatever your main language(s) is.
377: Your spittle contains a potent neurotoxin, which causes violent insanity whenever it enters someone's body (by being eaten, through the eye, a wound, etc.)
378: Life-threatening tumours grow on your body rather fast, getting large enough to kill whatever organ or limb they're part of, in about a week. You get one every few months.
379: You can intuitively guess computer passwords, lock combinations, and other stuff like that, with reasonable accuracy.
380: Your face loses all expression: you no longer give anything away with it, but you can't convey your feelings either.