Instructions:

Drive the car as fast as you can by tapping the Right Arrow Key and as you reach close to the wall hit the Space Bar to hurl the coffin crashing out of the wind screen and make it land as far as you can.
The red area on the road alerts you that the wall is close enough. Try to hurl the coffin closer to the wall to make it reach the maximum distance. At the landing point the coffin will be buried.