Those pressurized airhorns in a can will forever be instant fun in the palm of your hand. But the annoying part is that that fun eventually runs out. This air-powered PVC foghorn? Not so much.
Created by Instructables user rog8811 The 1950s-inspired foghorn consists of little more than some PVC piping, a rubber glove and a bike pump. And by configuring and adding pipe length to various degrees, you can change the magnitude and depth of the sound. Why yes, I think I will go and make my own. Thanks. [Instructables via Make]