See how to make an awesome ninja-style blowgun in this tutorial video. Get some conduit, like PVC or EMC, and cut them about five feet long. For a nice little mouth piece on the blowpipe, just get a PVC connector, or a EMC connector. Then, check out some blowdarts to go with those blowpipes. You'll see how to do it, all right here. Being a ninja never felt better.