Dan Luke wrote:

I've yearned for a big-asssed air horn on my airplane many times. Mostly
when the dweeb in front of me waits 'til he's at the hold short line to put
his flight plan in his GPS.

I carry a portable marine air horn (not unlike http://tinyurl.com/d6sukp) in
my plane for such situations. Lean out the window, push the button, usually
gets the offender to get his head out of the cockpit.

Best of all, its fairly cheap (for aviation) and requires no FAA
paperwork.

--
Frank Stutzman
Bonanza N494B "Hula Girl"
Boise, ID