THIS. I'm still pretty new, but I felt SO sheepish when, after logging a DFF, the CO sent me a message explaining what a LPC was. And then the epiphany hit and I was able to find 3 other DNFs, all while feeling like a total moron. Especially considering I had spent like 30 minutes digging in ground cover around the lamppost outside a Target.
Also, geocaching in flip flops, sandals or heels. I've done all 3 and regretted it each time. Just ordered some Wellies to keep in the car. I'm mostly an urban/suburban cacher, so I'm not really on trails/hikes, but I've faced mud, tall grass and bugs!
I've found myself without a pen, must have lost from my pocket it while searching.
I've also grabbed a cache in excitement and forgotten exactly where it was hidden. Once a nano with a screw-off lid was attached to a bush. I unscrewed the container, took it back to my car, then had to try to find the tiny, tiny nano-lid in the bush. I try to remember to bring my pen with me to the cache now, unless it's a P&G.