Everybody should have one. I guess this qualifies as flatwork. Ryan's post of the slip-bark whistle got me to thinking of the things I used to carve with my scout knife. This one lends itself to small branches and is an easy way to mess with your kids/grand kids heads. After they learn the secret you can help them make their own. I can't find the one I made 60 years ago, but it's still kicking around the house somewhere. Google for more.