On my brisk ride home from the gym, wet-from-swimming hair tucked into my cap, I witnessed a truly one-of-a-kind bike: a homebrew tandem. Both bikes were late '60s/70s roadies, one looked like a Schwinn Varsity, the other I couldn't identify from across the street. Back bike handlebars: drops, flopped & chopped. It sported only one rider, laughing at his performance, for its three wheels.
Alas, I'd left my camera at home.