I hate getting out and unfolding a blanket and getting all snuggled into it, only to find a HUGE spider on the floor. 'Cuz you know it came from the blanket. Not only do you have to kill the spider, you have to shake out the entire blanket for several minutes before you can be sure there aren't any more in there. Blergh.
Also, I'm never doing a Google image search for "spider" again. I just wanted a cute cartoony spider to put down here. Now there are horrible spider bite pics in my head! And even worse spiders than the one I killed (which was really quite large and nasty looking). Bad idea.