Years ago, after a cabbie cut me off (no signal and suddenly darting into the right lane) four times, I casually continued, keeping him in sight as traffic was somewhat heavy and he wasn't able to get too far ahead of me. As he dropped off his fare, I simply rode up on his left (he was blocking my lane, of course), leaned in his open window (he was facing the other way, giving change to the passenger) and plucked his keys from the ignition. As he whirled about to face me, I threw them high over a fence and heard a distinct splash as they landed in someone's pool. With a smile, I calmly said 'Perhaps I just saved lives, other than mine...and yours.' I could hear him cursing me up and down, fading into the distance as I continued on my ride.