Just a couple of my goofs from many years in photography.
Let me share one of my classic goofs! When new to photography and being a callow youth of about 13, I had mixed up some fresh fixer. I didn't label the bottle, relying on the "pickle" scent to distinguish it from the also unmarked developer. You folks can predict the outcome. I had a cold.... I couldn't smell the fixer, and I fixed the film in that fresh stuff. All gone.
Just recently I pre-loaded two daylight tanks. Must be genetic, I didn't label either. I souped one, then decided to do the other later. Again, you can see what's coming. All gone. Just the merest exposure in dim room light. 400ASA film. Now if I preload I put a strip of masking tape over the top, labeled with what the film is. So far, so good .... Until my next error.
My most recent camera loading screwup. Just one of many.
Here's another. Some time ago I was shooting with my Pentax LX, and really enjoying the silky smooth film advance feel. Ball bearings, I suppose. Then I noted that I'd run through 35 exposures on what I was sure was a 24 exposure cassette, since I almost never bought 36 load. Yep. Hadn't loaded the camera, a camera I'd been using for 8 or 10 years. Doh!