Ford's is pretty effective, but how do you punish drivers for such dangerous acts as turning or accelerating? Bring seven bucks to the junkyard, my friends, and you'll find everything you need to build the Ozzy Osbourne Inertial Penalty Horn!

This all started out when the at the Toledo race raised the bar for innovative ways to penalize lousy drivers on the race track. I'll be at the Houston race this weekend, so a special Texas-themed penalty would be needed. But what? Then I remembered: In 1982, Ozzy Osbourne was arrested for pissing on the Alamo, drunk and wearing a dress, and his albums were burned by enraged mobs throughout the Lone Star State.

And what was Ozzy's day job in Birmingham, before Black Sabbath hit it big? He worked on a British Leyland assembly line, testing horns! Naturally, the Ozzy Osbourne Inertial Penalty Horn would require horns from a BL product. While you might find the occasional MG or Triumph in self-service junkyards, 70s Jaguars are always plentiful. Mount the pair of genuine horns (high- and low-pitch units) on a crude bracket screwed together from scrap plywood, then add a Bosch-type relay pocketed at the junkyard (you can skip the relay, but the high draw of the horns will fry the switch contacts after a few applications, due to arc-welding-style sparking). Mount the bracket close to the driver, but not so close that he can reach it while strapped in!

The inertia switch- which is two-dimensional version of a pinball-machine tilt switch- can be made from junk just lying around; in this case, a piece of plywood (notched for easy zip-tie attachment to a roll cage bar), some coat hanger wire, plumber's tape, and a plastic windshield-washer tubing tee. Like all serious projects, the whole mess is held together with JB Weld.

The switch contacts are the plumber's tape on one side and a big Honda steering-wheel nut pocketed at the junkyard. Depending on how the switch is oriented, the contacts will close when the car accelerates, or turns, or decelerates… or when it hits a big bump, or gets a big gust of wind inside.

To get power, the alligator connector from a dead timing light clamps onto the car's battery. I added a 20-amp fuse inline and covered it with lots of electrical tape.

How to get the power from battery to relay? Cut a hole in the hood with this step drill and run the cord through the side window opening! Ram a sheetmetal screw into the car's floor near the horns and you've got your ground. Hey, they're $500 cars, right?