Do you kill spiders?

What is your general reaction to them? Do you react differently to a spider found in your house (i.e. your sleeping space) than one encountered outdoors? Do you mess with spider webs? Did someone or something influence the way you feel about them?

For example, when I was a kid, my dad told me it was bad luck to kill spiders, so I learned to pick them up with a paper towel and place them outside. My husband will step on any kind of bug he encounters without thinking about it.