What does a bee sit on?

Harrison has been published!!! The kids and their grandpa have an ongoing battle for the best joke. It's an event at every family dinner. We all gear up for it before dinner and come with our best jokes to contribute. Every now and then we'll also come home to our answering machine beeping with a riddle from grandpa, and then we have to come up with the answer and call and leave it on his answering machine. It's tons of fun, and the kids get so excited to find out the answer to the joke left for them. Harrison and grandpa had this joke between them, and Harrison submitted it to the website jokesbykids.com. Go there, enter Harrison in the search, and scroll down to his joke to get the punchline!!!