Austin, Texas -- Actor Matthew stopped traffic for nearly an hour on a busy road outside of Austin, Texas today. The actor was attempting to "unicycle his ass off!" in the middle of the road, causing cars to slam on their brakes.

The delay was further compounded by the fact that the "A Time To Kill" actor was apparently attempting to ride a plain bicycle tire without a seat.

According to eyewitnesses, Mr. McConaughey repeatedly tried sitting on the tire and attempted to balance.

"He was just sitting on the tire, and then he would start flailing his legs and whooping like he was at a rodeo or something," said eyewitness Harold Crutchins.

Police were able to clear the area, and Mr. McConaughey left without further incident. No charges are expected to be filed.