When I was living in Southern Cali, I had a minor Black Widow infestation in my garage. When ever I'd see a fair sized moth or other such critter, the widows in the garage would get a free meal. I did get bitten a couple of times by them, and I was always surprised how minor the bite/pain was. It was really no more painful than a bee sting, and cleared up in a few days.
The creepiest thing they ever did was hide in the shower, usually in an upper corner. Talk about a quick way to wake up, coffee has nothing on them.