I just sat down and pulled a bunch of books out of an old bag to sort through when I felt something tickle my arm. I turned the books over and saw a very big (BIG I tell thee!) spider starting to walk up my arm, from where it had apparently been exploring my books.
I wasn't totally super-cool though as I still made a 'slight' noise and chucked the pile of books across the room. The spiders fine though. I just saw it skittling away behind some boxes.