Actually, people, it isn't that unusual for a single person to be sensitive to some particular chemical. Darp may be, and 999 others aren't.

I my case, I experienced some really unpleasant symptoms after hiking or skiing (at altitude of course), and finally related it to taking Excedrin. I had the problem three times: Hiking or skiing, near the end of the day, took the Excedrin (it has aspirin, caffeine and tylenol). Soon after, I was nauseated, and spent hours feeling awful. I never barfed, but was on the verge for much of the time. After I figured out the relationship, I've stopped taking it, and have never had the experience again.

I know a kid who becomes violently ill if he comes into contact with any milk products. So bad his mom packs an Epi-Pen.


Getting back to Harvey's original post, and from the SAR report:
"the subject's history of exercise-induced seizures."
Sheesh, I've never heard of such occurrences! But few things amaze me anymore. I'll bet that guy doesn't do any epic hikes again.