I plucked the delicate little flower from the lawn in the neighbors yard. I dutifully held the blossom up beneath my chin, tilted my head back, and had the neighbor boy check to see if there was yellow reflected on my skin. "Yep," he declared, "you like butter". I then innocently popped the blossom into my mouth as I had done hundreds of times before. My friend ran inside yelling to his mother that I had eaten buttercups. A quick call to the poison control center had the neighbor woman completely unhinged, and feeding us big glasses of milk mixed with mustard... to induce vomiting. There are several varieties of buttercup blossoms, and apparently some of them are poisonous. As a five year old, who knew? To this day, even the slightest aroma of yellow mustard sends my stomach rolling.