I was going along the road earlier, following one of those hideous Zoomer bikes that u.13s seem to like to go crazy on. It was actually being ridden sensibly, and both driver and pillion were wearing helmets

As I was pulling over to park, the bike came to a sudden halt in the middle of the road, and the driver jumped off. After doing his blue arsed fly impression for a while, it became clear that his passenger had become entangled in the chain mechanism, and couldn't budge at all.
A lot of dashing about, and shouting for help, somebody actually managed to cut her free - thankfully, it was only her trousers that had been dragged in. She had a nasty looking marked on her ankle, but skin had not been broken. She did roll what was left of her trousers to look like shorts, and smiled about it afterwards.
It did take several minutes for them to remove the tangled material from the chain mechanism.
This looked a fairly serious design flaw, and I was amazed it could even happen. I'd have thought there should have been safety guards to prevent such incidents. Now, not being a bike person, I did notice that his tyres looked totally out of place on the little bike - wider than my truck tyres. So had the guy pimped his bike, and in the process had to remove the safety guards? Or does this happen regularly, and I've been going around with my eyes closed?