Hear the funny sounds of antique automobile horns. The 1912 Pierce-Arrow has that awesome cartoonesque sound, definitely a winner. If you ever hear it in real life (many hot-rods have them too) some of them are loud and you immediately recognize it. Here's another website with car-horns by the Antique Automobile Club of America, and a video of a model-A: Renfroe's Model A Aooga horn.
Thanks Doug!