Nothing.
An AYE-Phone. (Joke brought to you by a 5 year old)
5-year-old: I haven't had my coffee. Me: You've never had coffee. 5-year-old: Exactly.
Me: A dog. Duh. Neighbor...
Student: I don't know. Teacher: Of course, you do. Where do you get sugar from Student: We borrow it from our neighbor.