A,B,C's (and Sesame Street)

Reading a book about the A,B,C's to a group of 3 year olds. A is for and we named the children in the class that have names that start with the letter A. Then we came up with words that start with B. "What starts with the letter C?" I asked. We talked about a few and then I hear a boy yell "C is for cookie!!"