Etiquette advice

I once followed a bloke who have a slack chain for about 10 minutes (going on the same route as he is, you know, the long straight of Southampton Row), as I slow down and approach him casually mentioned the slack chain, turn out he's running singlespeed, just never stopped pedalling.

"so why do you keep pedalling thought?"

"people will assumed I'm riding a fixed wheels"

what the fuck?

i was overtaken by a man on a fillmore, and followed him for a while. (it was that thing where soomeone so desperately wants to be in front of you, you just let them) he was totally doing this. i told him 'you can pedal as much as you like, but it won't magically turn into a fixed wheel'. he looked sheepish.