If you really want to scare the living daylights out of the granny driving her SUV to the supermarket, use this helmet. It's the Impact Nitro helmet, containing an air filtration system that can function on its own, or coupled to a bottle air system.
Around the helmet is a Kevlar skirt, making it fire resistant. Paint it black, remove the stickers and start talking like you have asthma... instant Darth Vader .
It's not cheap, but what the heck... what's the price of fun:
Price: Around US$699.
Via: The Scooter Scoop