You might find one in your house.
You can find a lot of "How To" videos on making your own pneumatic jumping spider. Here is a link to a great how to build a jumping spider; http://www.youtube.com/watch?v=iY3NZA5ZA2c.
No a jumping spider can kill a black widow. A jumping spider killed our huge black widow that killed another spider.
My guess is that this spider you saw was either a Jumping Spider (quite possibly a Daring Jumping Spider) or a Parson Spider.
I believe its a jumping spider
Jumping Spider lives in the rain forest BIG ZERO! In my mentors car i saw a jumping spider n in my house there is jumping Spiders
You can go to frightcatalog.com to find a hairy jumping spider Halloween prop. They also have a wide selection of other Halloween props available for decorating.
Jumping Spider
The jumping spider family, Salticidae, contains more than 5000 species of jumping spiders. The best way to avoid a jumping spider is to get rid of it, either by catching it with a tissue or using a flyswatter to squish it.
I just caught a spider that matches this description. After looking online, I think it may be a jumping spider from the family Salticidae. I believe that spider is Phidippus Audax a.k.a the Bold Jumping Spider.
Yes!
Jumping spider
It is the common "Daring jumping spider," Phidippus audax. It's completely harmless.