Near Edinburgh towards the end of last week, I was standing waiting for the pedestrian crossing lights to go green on a one-way road. I was at the back of quite a large group of people.
The lights changed in our favour, and the cars started slowing to a stop. As they did so, a well-dressed man (early 40s, in a grey suit) hurled what looked like a pink milk-shake in a cardboard cup really hard at the windscreen of the car closest to us, then turned and walked away very fast (but not running).
Everyone was stunned, especially the driver of the milkshaked car (the result of this was that nobody at all crossed the road, and only the far-side cars started moving past, slooowly, all staring).
The Milkshaked car driver hand-swept his windscreen clear of strawberry milkshake, and handed the cup/lid/straw to an oddly-obliging random person, shouted "BASTARD!" in the general direction of the long-gone perpetrator, got back into his car, and drove off (windscreen wipers and water-jets on full blast).
I think it was random.
I don't think it was staged (could it have been?)
Very odd.....