You know how you train yourself (I'm speaking for myself here) to not look down every time you feel an itch? There's no possible way that it could be a bug/spider EVERY time.
So I've gotten pretty good with this, but today on the way to work...this didn't feel like any ordinary itch. I looked down and SPIDER! I flailed, trying to kill it, but now it's gone. So now...every itch I'm paranoid it's the spider AND I'm pretty sure I'm going to have to burn the interior of my car as a precaution.
(And I should probably shave my hair off).