If you really want to be devious -
Instead of the flare, try taking a small stainless clevis pin and a bent up stainlesss cotter pin and shoot them into the offending boat's main sail with a sling shot. They will fall to the deck and have the entire crew wondering what piece of rigging is about to come apart.
Instead of the flare, try taking a small stainless clevis pin and a bent up stainlesss cotter pin and shoot them into the offending boat's main sail with a sling shot. They will fall to the deck and have the entire crew wondering what piece of rigging is about to come apart.