There is a stone on the road. You walk blindfolded and stumble Seriously speaking, stumbling is to StumbleUpon what Googling is to Google. Assuming that you have FF installed, get the toolbar and start stumbling. Can be a decent source of traffic.
stumbleing is when your walking along minding your own business and you catch part of your body on a fixed object and you almonst fall over but dont completly hit the deck.