Twice in 12 months. The first time, last summer, I went into anaphlaxis and ended up in the ER where the nice man in the white coat told me "Congratulations, you're allergic to bee toxin." Okay, he didn't really say "congratulations." But he did give me a prescription for an Epi-Pen, which came in handy the second time I was stung on a ride, about a month ago.