I've been called fairly regularly to sub the last 2 weeks, and it's something brand new everyday. Part of the fun of it for me is having a whole new set of kids each day, sometimes whole new age groups.
Yesterday I spent the afternoon in one of the kindergarten classes. One small girl sitting in the front row during story time was frantically waving her hand. When I finally called on her, she held her hand out to me and said "Mrs. Fitz, I picked some boogers out of my nose... can I go throw them away?"