I once had a gentelman come in to the ER stating he was allergic to crabs and had just accidently ate some. While writting the chief complaint I asked him why he ate crabs when he knew he had a shellfish allergy? He replies not sea shellfish ones but the ones that my girldfriend has. My doctor told me after having a reaction before to crabs if I accidently ate some take some Benedryl and head to the ER. So I wasnt sure if these where in the same family…I nearly died right there on the spot!