Which david letterman episode did a man try to walk on water?

In the November 21, 1980 episode of "Late Night with David Letterman," a man named Bob "The Water Walker" performed a stunt attempting to walk on water. He used a large tank filled with water and, dressed in a wetsuit, tried to demonstrate his ability to walk across the surface. The humorous segment became one of the memorable moments from the show's early years.