Although the underside of a fresh banana skin does have some friction-reducing properties — a single peel isn’t a guaranteed fall magnet. However, if you’re determined to see some major slippage, try running on layers of peels. This reduces static friction, the force that keeps an object from moving when it goes from “stop” to “start.” And the older the peels, the more slippery they are, because the solid material decomposes into a soft, slimy texture.

Source – http://www.discovery.com/tv-shows/mythbusters/mythbusters-database/slip-and-fall-on-banana-peel/