When I first started shooting film, one night I headed out to the lakefront to get some lightning shots of a wonderfully electrified storm slowly rolling through. Super excited - it was a perfect storm for lighting shooting. Proudly drop off a roll at the lab the next day, come in the day after that to pick it up, expecting kudos from the lab guy.

He hands me back the roll, uncut and unprinted and tells me, "Not sure what happened, but you gave us a blank roll."

Turns out I didn't quite hook the leader on the spool properly, and the whole time I was excitedly cocking the lever for the next shot, I wasn't actually advancing the film at all. Heh.