Thanks for the tip. I wouldn't lay on it anyway, since you have to continually add air. I would hate to run out during a ride because I felt the need to be overly aggressive, then when I really needed it, I would be out of air!
The only caution I do have is that I think in Illinois, we are not allowed to have air horns on our bikes- bells are fine, but not air horns. I'm still going for it, but I'll avoid using it if the cops are around.
Koffee