Jumping Zebra Spider
If the notion of a spider leaping in your direction is worrisome, try imagining one that, relatively speaking, has way more "ups" than Michael Jordan in his prime. Salticus scenicus, which is found in North America, Europe and northern Asia, can jump an astounding 20 times its own length [source: Earth Rangers].
Before you totally freak out, keep in mind that the jumping zebra spider is only about a quarter of an inch (7 millimeters) long, so it's not likely to do you much harm [source: Earth Rangers]. Besides, these arachnids primarily feed on pesky insects such as mosquitos and flies, so they're very beneficial to humans [source: ADW]. And when it looks at you with those plaintive eight eyes, who could resist its charm?