that's good in theory, until a theoretical cabbie decides to try and jump out of his vehicle and run after you when you're stopped at a light, yet still theoretically have time to catch up to you while you're trying to let your s/o know there might be an irate cabbie after you however there's still theorectically a chance to dodge down a side street while he gets the cabbie trapped in an alleyway (the integrity of said mirror being in some question) and you arrive home half laughing, half wondering if the guy's gonna go after some other poor cyclist... i mean, in thoery.

that being said, i agree with what someone else wrote: "i figure, if they are close enough for me to knock, then that may be just too close"...