Cherryman715

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It's something to do, you know? A chance to be where a very small number of Earth's population has ever been... the lust it causes to find a new crag nobody has ever scaled. To do something that (many) people think to be insane, although it's only inherently dangerous. If you're smart about it, you're always safe. The unity of climbing buddies, literally putting your life in another's hands (plus it's a real turn-on for chicks, although that's just an added benefit). The stories of trips from hell, the bragging rights for first sends. Then, of course, the post-crag grub. I recall one day climbing at Garden of the Gods in Colorado Springs... some random tourist (they come in abundance there) offered to buy me a beer after a climb. I was 16 at the time.

Shibby

The ease with which I sent my first 5.11a, only to turn around and get my ass romped by a 10c.

Or, finding out that the tension of slacklines is stronger than the masonry work of a certain house in Greeley, Colorado. 

Leave it to Kevin to get his fingers sliced open by some well-rounded conglomerate (more of a geology joke, really... you had to be there)