Conversely, this morning, I was riding up to Mitcham Junction station and heard a regular 'fap fap' sound. Now, I know it's a bit wooded round there, but... Aaaaanyway, I was then passed by a car with a very flat tyre. I pulled in front of her in the queue and called out and pointed, while she gazed vacantly. Two other cyclists tried to explain as well, but I don't know if they got through. She didn't pass me again, so maybe she'd turned off into the car park to get it fixed.
I've recently been yelling at cars every night. Those ones with no lights on in the dark. A couple of nights ago, one realised I wasn't just a random maniac, switched the lights on, and flashed the hazard lights, presumably in a gesture of thanks (unless it was a genuine warning of danger).
Hijack over...