My Cobra has been up on the hoist for the past week and I walked into the workshop the other night to have a look under it. It was a bit dark and I walked through a spiders web that was strung underneath it. I then proceed to have an Arachnoleptic fit. That's the jerky dance you do when you are trying to get the web off you and check if the spider is on you somewhere.
We have a few nasty spiders down here. Red Backs are pretty common in the shed. They are an Aussie cousin of your Black Widow.
Cheers