Temporary lights in Baslow (Chatsworth, for those not familiar). You wait patiently for your green light and hope as many get through as is legally viable. But a charity driver at the green light sees a lorry wanting to turn left into the oncoming road, so rather than just carry on and wait for the lights to go red so the lorry can pull out easily, they decide to let them out now, meaning that whilst saving this one lorry a few seconds, they massively piss off the long queue of cars behind them wanting to get through the lights.
I was lucky, I still got through but it will have considerably lengthened others' days and also the queue back to the roundabout.