Just toss a clear glass marble over your shoulder. They shatter into glass shards as they crack the windshield that are too difficult to distinguish from windshield glass to be used as evidence.
Retune your carbs to make the pipes pop as you back off the throttle. I find that at least some the time, speeding up a bit so the idiots can see the pipes, then backing off so they can see puffs of blue and yellow flame from the pipes is enough to convince idiots that they don't want to get too close.
