Cameron has been trying to find the Tarantulas on Mt. Diablo every fall (mating season when they are supposedly everywhere, crossing the roads, etc. I say "supposedly" because I will never be witnessing this for myself). Well, on September 18, he saw 6 of them. Here's a perspective of their size relative to Cam's size 12 bike shoe.
In case that's not creepy enough for you, here's some video: