So, finally I need to get this off my chest. I volunteer for my local sea cadet unit (where one of my kids goes) and they've asked me to deal with all of the photos of events etc. We live out in the country so is a 20 mile drive to the unit (which is local to where I work). A few weeks ago, it was a two-yearly inspection which is a VERY big thing for the unit. The kids practised at length (including staying over a weekend to go through it all) and several dignitaries were present. I duly turned up with my big Domke bag containing X-T1, 16/1.4, 35/1.4, 50-230 and two Godox flash units, a Godox TTL controller and a flash bracket. Unfortunately, that morning I had swapped from my usual bag into the big Domke. Anyone spot what I didn't bring? Batteries - and the one in the camera was showing 2 bars when I started, which meant it dropped down to nothing within a few shots. Boy, was I embarrassed! My late father was a professional photographer, and once carried on to a wedding after being shunted into a wall in his car (the car was badly smashed up and he had to get a taxi) so that only makes it worse. What's the stupidest (photo related) mistake you've ever made?