I saw a few people who classified as stupid:-
On the 3rd day I saw two Japanese riders passing me in a group taking full advantage of using aerobars, riding along happily whilst in the aero bars holding "Action Cams" in both hands, looking down at the screen as the aerobar position now allows you to do this. Don't know how you brake in an emergency when both hands are holding a camera like a squirrel holds a nut, probably drop it.
Second night, saw a rider with a blue light on at the back along with a red one, from a distance it looked like an emergency vehicle, I also saw him third and fourth night unless their was more than one doing it. On the fourth night, I saw the motorcylist's just ride past him but they stopped a rider with no back light in the same group.
Third night, saw a rider with a front light on the rear, once again the motorcyclists just rode past him, unless they was confused in passing and thought they had stopped and facing the wrong way.
On the third night, saw a good few with no backlights and also with flashing backlights but once again, the motorcyclists just rode past those with flashing rears.
But, I suppose the stupidest rider goes to the one on the last night when I had a rider passing me very close and another rider tried to squeeze through the gap and they did not fit and crashed into me sideways on as they passed, they left me struggling to balance, not to run off the road and not fall off all at the same time and all they said was "Sorry" as they kept going. They had all the other side of the road to overtake so why try and go through a non existent gap.
Since after starting and an "hour an a quarter" later when the group behind caught me and overtook, I knew this type of incident was on the cards. Virtually every group would speed past almost touching bars, the leaders would pull in front the moment they overtook and then all the others would follow suit. Every time I braced up in case I got rear ended by an idiot racing up the inside of the group. Why they passed so close and then swerve in, I don't know, their was nothing to gain and increased the chances of an accident and it happened many times right up to the finish.
I promised myself to do PBP 3 times, now that I have completed that task, thankfully I will never do it again.