I've never in my life felt like a moron as often as I have since I took up geocaching. No worries that I will be getting a big head anytime soon. This is not fake modesty: I'm reasonably bright, but some of my fellow cachers must have IQs that are through the roof because the puzzles that they set are positively fiendish.
I'm currently working on a challenge that requires me to solve a bunch of those evil puzzles. The one currently causing me grief has about four stages and I still haven't gotten through the first one even though I've already found information hidden in the source code of a web page and converted it all from base-16 to base-10 so I can plug it into the online decoder for a particular obscure kind of cipher. (I'm doing something wrong with the decoding, I think.) For any who might be wondering, this is masochism at its finest since it is a completely voluntary activity! I must be out of my cotton-picking mind.