My unopen can of Mountain Dew. A sponsor by them was happening at my local convention for some gaming stall, they were giving a few thousand for free only for em to run out when I try to go get another one...
It may be a little surprising but I lost the day 2 ticket of SGCC 2019 at SGCC 2019, I was putting on the helmet and reached out for the mini USB fan in my pocket (must have slipped off from there). I should probably stop stuffing my pockets
The last con I went to I got lost. I couldn't find my friends, I was wearing a low visibility Batman cowl. I also panic every time I wear my Batsuit because I built a cellphone holster in my gauntlet and I always check my pocket for it and freak when it isn't there. So, my mind. I lost my damn mind.