You know how quickly animals can jump out in front of your car, but imagine an animal jumping in front of your bicycle.
That's exactly what happened to one mountain biker in California and it was all caught on his helmet camera.
He was riding along a path -- and when he came around the corner, a bear was crossing in a shaded area.
He couldn't avoid the bear and T-boned it. The man flipped over the handlebars and onto the ground.
By the time he looked back the bear was gone.
Watch in the video player above.
