I've been shooting film for decades and have always done a great job developing film. I had just changed the light traps on my Hasselblad backs for the first time ever and had to test them out. I went to Yosemite and decided to take a panorama with the Gigapan using film. So I shot 12 photos, went to reload the film back...uh...only ONE roll of 100 ISO film and I just used it. I had 400 ISO but decided I didn't want to see the grain. So one roll was all I shot.
I brought it home, developed it and was mortified at what I developed. The light trap, for one, didn't work. There were light leaks everywhere. I need to redo it correctly (thank goodness I only shot one roll). I didn't tap the developing tank hard enough to release the air bubbles because there were tons of it. The development looked very uneven, though that could have been caused by the light leak. Worse of all it looked like I didn't use Photo-flo properly, if that's possible, as there were water marks everywhere. It was just a mess. All I could do was laugh at the results.
I'm going to post my most embarrassing moment because I want people who are just learning to know that even with decades of experience developing film that it's still possible to screw up a roll of film. Also goes to show that things happen for a reason. If I had more than one roll of ISO 100 film I would have ruined them all.