I had a nightmare situation with a very elderly man who couldn't reverse. There's a stretch of country lane near me which generally has very little traffic as it is narrower than the other routes and very windy, with a couple of steep little hills and few passing places.
I use it very occasionally when the main road is backed up, but I try to avoid it most of the time. A few months ago a lorry jack-knifed on the main road and they closed it and diverted traffic down the lanes. I had a clear run up to the absolute worst point, when I met a long row of traffic who had apparently been told by a motor cycle police officer to go that way. He clearly didn't know the road!
I'd just come down a very steep slope with a lot of mud - it had been chucking it down and the lanes are fairly muddy at the best of times - and the first vehicle was a van. I tried to reverse up the hill and couldn't - the car was just wheel-spinning in the mud so the van and I managed, with a huge amount of co-operation and heads out of the window going 'You go. Right stop! I go. Now you!' to squeeze past each other. The next car had been waiting a fair way back, which should have let me go forwards so that the van could back up and get a run at the hill. Unfortunately, the elderly driver didn't realise what was going on and drove forwards to fill the gap, so I couldn't get out of the way of the van and the van couldn't get up the hill. It then transpired that he couldn't reverse. The van driver and I tried everything but until he reversed no-one was going anywhere. We were all out of our cars with various people offering to back his car up - the ones behind had left space for him - but he kept saying he could do it, and promptly reversing into the hedge.
He eventually got back just far enough that the van managed to drag itself up the hill, with a massive smell of burning - and then he surged forwards again and blocked me from being able to get into the only bit of space that would have let him and all the cars behind him get past. More wriggling on my part, and I managed to get far enough into the hedge for him to get past, but by that point he was so worked up that he decided he couldn't fit through and refused to even try. Instead he decided that he wanted to reverse all the way back down the lane. Eventually one of the drivers behind him went and looked and said there was a field entrance and if they all reversed past it, I could pull in there and let the man past. So 5 cars reversed a couple of hundred yards down the road, clearing the whole lane for the man. He got there eventually, bouncing off hedges and grounding his car several times in the process - and then he reversed across the entrance to the field, and I had to get out again and explain what needed to happen.
It was probably best part of half an hour before we got ourselves sorted out. Fortunately everyone stayed fairly relaxed, and fortunately the next batch of cars had realised what was going on and stayed right back down the lane at a farm entrance, otherwise I'm not sure we'd ever have got out of there.