Tested out my new homemade air horns when I rode into town. They work pretty good. Gave a demonstration inside the Army Surplus store!

This air horn, made from a pill bottle, is even better yet, and very loud! If you have the hole for the straw really tight, then you can adjust the depth of the straw, every so slightly, and change the tone of the sound:

Another pill-bottle air horn, even better!

Here is one of my pill-bottle air horns I made last night. Works very nicely, and is very loud!