http://www.youtube.com/watch?v=pt0pDvs9Uk8 In this video I make a whistle using a wooden mallet.  It’s a fun variation on a popular toy, which you can keep around the workshop or site, and surprising people with its absurdity.  I had to increase the angle of the labium at one point, which I did with a saw off camera.  And it goes without saying, you should test your pieces before you glue it all together.