nobody mentioned camel spiders yet. i've spent 2 1/2 years in iraq during OIF so i had a fair amount of encounters with them.
http://farm2.static.flickr.com/1065/...7473ae.jpg?v=0
how do i embed pictures...
i found one of these in my sleeping bag before, really didn't notice the sucker until i scratched an itch. the itch was the spider brushing my ankle!
i was a medic and i found one of these suckers on my aid bag too. it shocks me every time i'm unexpectedly confronted with these things because of it's size and nasty jaws. their jaws are strong enough to crush a tiny mouses skull, i've seen it done and there's movies on youtube too!