My bike has a pretty decent horn, or so I thought. But yesterday when out for a ride I encountered a driver who was weaving back and forth, crossing from his lane to my lane every once in awhile. I thought I might be dealing with an intoxicated driver and was really wary. So when he moved far to the right of his lane I accelerated quickly to get past him. Just as I was passing he started moving left again, and I hit the throttle and the horn. But it seemed clear that he was totally unaware of my presence, as I saw big headphones on his head and his head was bobbing around apparently in beat with his music or something. So it got me thinking about installing a real air horn on the bike, something loud enough to get the attention even of a headphone idiot driver. But then I start to think about more normal circumstances and I don't want to overly startle some old lady into a heart attack or a dangerous sudden move in response to the sound. For what its worth, it seems that dealing with distracted car drivers has been getting worse over the last 20 years or so and I see no signs of it getting better.