The method of walking down a drain is something of an art. If your footwear sucks, you'll likely want to avoid the center stream to keep dry. But even with proper footwear, the center often has slippery mineral and plant buildups that complicate easy movement. Thus, the so called 'drain walk' was born. You walk on one side of the pipe, above the water line. Simple, right? Predictably, it's not as easy as it sounds. Given the slope, one tends to get quite unbalanced after just a few steps. To fix this, the instinct is to hop to the other side.

See where this is going?

Step step, hop. Step step hop.