Sitting outside near work I felt something drop on my head. It was a tiny green spider, no bigger than 1-2 mm across. It is not the first time I have felt such. Here's the thing, I'm bald and felt the spider land on my head, could feel it crawling around up there, too. I doubt anyone with hair could feel this tiny spider drop onto their head.
Spiders in your hair! Too bad people with hair.