My little sister is allergic to peanut butter. I don’t know how she can survive, having never tasted a Reeses Peanut Butter Cup. But one time when I was in high school, I made some peanut butter cookies in the kitchen while she was in the living room watching television, and she started having issues breathing. Let’s just say I felt like a jackass. And never baked anything with peanut butter again while she was around.