Found a black widow spider on our porch a long time ago. I sprayed it with my mom's hair spray for about 30 seconds. It didn't curl up and die or anything, but it immediately turned greyish/white and became very brittle.
We had a small outburst of wolf spiders in our backyard last year. They look pretty cool and make moderately sized webs. I got a big kick out of catching bees, wasps, moths, flies, butterflies, and the like with an old minnow fishing net and then throwing them into the wolf webs and get eaten. Muwhaha....I shall provide my children.