Nothing quite says "Holy Crap" more than to come home from Ireland and find the one room of the house you thought was organized (east side of the basement) a complete disaster. Granted it wasn't anyone's fault (we had to move out the other side of the basement, which was a disaster for the new furnace). But it was definitely the motivator to organize ALL the boxes in the house from top to bottom - Martha would be so proud.
To give you an idea of how insane it was, at one point I collect ALL the nails, screws, small metals tools, etc that had been collected in various jars and drawers throughout the house, and organized them in a small drawer filing system. The pictures of each drawer are now sitting on my iPod touch, so the next time we're at Lowe's and about to buy another small bags of screws, I can prove where and how many we actually have.
It doesn't end there - all the books in the house have had their barcodes scanned and entered into the MacBook. Every rubbermaid huge plastic container has been indexed and contents photographed. I think it's make anyone with OCD a little weepy.