Brian Matusz, the southpaw relief pitcher for the Baltimore Orioles, went out to dinner after a game and didn't realize his dish had been cooked in peanut oil.
Matusz, who has been allergic to peanuts since childhood, started to experience anaphylaxis, a potentially life-threatening severe allergic reaction. He injected himself with his epinephrine auto-injector and went to a nearby hospital where he then suffered another reaction, known as a biphasic reaction.
Matusz recovered, rested and returned to pitching two days later. "It's one of those things I have to deal with. I have to be prepared and take precautionary measures. I have to be careful."