Who Put That Hair in My Toothbrush? Sibling rivalry at its finest! Whether it's on the hockey ice, at school, or at home, Greg and Megin just can't seem to get along. She calls him Grosso, he calls her Megamouth. They battle with donuts, cockroaches, and hair. Will it take a tragedy for them to realize how much they actually care for each other? | Who Put That Hair In My Toothbrush? by Jerry Spinelli, Paperback | Indigo Chapters