A professor many years ago told me a story a student had told him — she was in an elevator, a bee stung her, and she began to get an anaphylactic reaction. A man inside realized her distress, didn’t know what to do, put his hand on her shoulder. The woman got so angry being touched by a strange man, her body set off a natural “fight or flight” response, and her own adrenalin (epinephrine) calmed her reaction. Moral — in such a case, while an ambulance is en route, maybe do something immediately outrageous or obscene (but explain rapidly to bystanders why). I’ve never had occasion.