Unusual car crash in Atlanta

Can you explain what happened in this accident caught on video surveillance in Atlanta? WSB-TV explains:

a driver in northwest Atlanta drive off Marietta Street and speed through a parking lot before crashing onto the roof of a chiropractic office.

A second video shows the car falling off the roof and onto a driveway below. ... Chappelear also told Channel 2's Justin Wilfon that [driver Stanley] Clarke’s foot became stuck between the gas and brake pedals, causing him to lose control.

Mr Clarke was unharmed.