Hold on to your hats... today I saw this guy. Its almost like a deep water scorpion. Look at the poison he squirted after I poked him.
http://usera.imagecave.com/donuel/don1/bug1.jpg
http://usera.imagecave.com/donuel/don1/bug2.jpg
http://usera.imagecave.com/donuel/don1/bug3.jpg