Tronds, I wouldn't touch the pre-wash thing if I were you. You'll start a war.

On the other hand, that might be fun to watch. I'll get the popcorn and Coke. :munch:
I know that.
Prewashing MAY work well, but many have got problems because of that. Many of them has stopped using prewash and the problems disappeared.
Uneven development is the devil that lurks in the shadows.
Some have even tried prewash with two-bath developers. That is a recipe for catastrophy.
But since this is about darkroom mistakes, I have to supply mine.
I was loading a Tri-X 120 film into a plastic reel. Well, at least I tried. It woldn't go in. It just jammed time after time and I had to pull it out of the reel and try again. After working with it for about half an hour in the fumblebag, I managed to get the now hot and humid film onto the reel.
After development it had a lot of scratch marks and half-moons from bending the film.
I later discovered that this reel had a defective locking ball on one side. It grabbed the film and just locked it in place.
After this incident I check all my film-reels for function before use.