A couple of times, when loading holders I've missed the "interleaf" sheet and loaded a piece of black paper in front of the film: that sucks.
Fumbled a roll or two (or three) of 120 film before attaching the tape: that sucks.
Got distracted and opened the back of a 35mm camera without rewinding the roll: really sucks.
Bumped the X/M switch on a Mamiya TLR lens to "M" while shooting flash at a wedding. Lucky for me, it was near the end of the roll and I ALWAYS checked the switch after reload: could have sucked a LOT more than it did.
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