Hipster #1
A bike white enough to be a ghost bike, fixed wheel, so having just the one brake (on the front) would have been fine, but for the fact he also just had normal flat pedals (riding in normal trainers) and no straps, so possible 'braking hard' control issues there then. Drop bullhorns and so on. Dress code however wasn't hipster (baseball cap, blue waterproof jacket, shorts, Nike or simmilar trainers)
Hipster #2
Ticking all the boxes. Fixed wheel bike (with toe straps) covered in stickers saying things like "F*** Cars", single brake (loses points on total hipsterness for having one), teeny tiny narrow bars with a bit of a rise on them. Riding very slowly, but skinnily moving up the inside of any stopped traffic (I reckon he was rather frustrated when I slowed to a trackstand in the bike lane because the lights ahead had turned green and the next car in the queue was indicating left). Dress code was pretty hipster too.