Heelys

If you learned to skate at 9 months of age, you are having a mid-life crisis, and you hate your job, what do you do? If you're Roger Adams, you invent a pair of shoes you can roll in.

Unlike other types of skate shoes with two wheels, Heelys have only one detachable wheel in the sole, under the heel.

Wearers can pop the wheel out by simply pointing their toe upwards, allowing the user to switch from rolling to walking and back again in an instant. Learn More about Heelys.

Pictured: Heelys "Venture"
Images courtesy of Zappos.com.