Introduction: PVC Air Horn to Scare Your Friends (or Cats)
Build a home made air horn out of PVC pipe. This air horn is very loud (but not deafening) so you can use it to scare the trick-or-treaters when they come to your door! Combine this with last week's floor switch project to make it automatically go off when someone steps on the switch!
We have a be nice policy.
Please be positive and constructive.