On one of my first camping trips many years ago in pitch-black darkness I climbed into my tent to prepare for sleep. I turned on the light that I had tied to the ceiling and the walls were covered with 2-3 inch spiders and all sorts of other creepy critters.
After I calmed down and got them out I realized my stupid mistake earlier in the day. I had left all of my stuff outside for most of the day (sleeping bag, duffle bags, etc), and had only put them in the tent an hour or so before retiring for the night. The little buggers used them like a trojan horse to get inside the tent.
Where was that? I would like to never camp there.