A friend of mine wrote me an email about a little experience he had in Iraq recently - being bitten by a camel spider that was hiding in his sleeping bag.
Camel spiders, mind you, are just about the ugliest spiders imaginable. They look like something out of a bad horror/sci fi movie.
What's worse is how they move when aggressive. They run. And they run fast. And they raise their front 2 legs in the air, sprinting on the back 6.
We used to have them alot when I lived in Saudi Arabia but this photo he sent me is one of the first I've seen the does the ugliness of these things justice. One of his friends holding up 2 of the bastards.
Imagine waking up in the middle of the night, feeling some movement down at the foot of your sleeping bag. You lift your head and peer down towards your feet. That movement, in turn, panics the spider and so he attacks the source of the motion - your head. Boring down on you at full speed, his two front legs raised high above him in the air, this is what you see:
http://www.slamnasty.com/camelspider.jpg