That is usually because of “squirrel hazing”. Someone did an exposé on this awful tradition years ago. http://web.archive.org/web/20090430092024/http://squirrelhazing.squirrelsinblack.org/
I put glow-in-the-dark vampire teeth in my mouth and then smiled when my mom came to tuck me into bed. She screamed and then I never saw those teeth again!
I like it! The cartoons really pop with the new coloring method.