h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

When I was getting certified, the instructor refered to the "Martini Rule." Every 10 feet past 100 ft is akin to drinking a martini. One of my favorite "signs of narcosis" from that dive class, mind you it was the same instructor as the martini rule, was "if you see your buddy trying to give a fish his octo because the fish doesn't have a reg." Oh, and I almost bought the t-shirt featuring a very wacked-out frog in scuda gear with is tongue lolling and giving the thumbs-up with the words "I've got Nitrogen Narcosis. What's your excuse?"