I have a friend in that lives in Gilbert AZ. He is invaded with Scorpions! We grab a beer and a blacklight and head for the backyard. After you see a hundred or so of the little glowing buggers, it gets a little creepy. My skin crawls for hours after that.
I got stung years ago by a scorpion, and it hurts... ALOT! Also have been stung by one of these
http://en.wikipedia.org/wiki/Tarantula_hawk , and let me tell you, it was the most painful 3 hours of my life! Followed by many hours of numbness. It was in my shoe, and it hit me 3 times before I could get the shoe off. I screamed like a horror movie chick!