This is why there was a repeat.

Snowboarder Hurt During Letterman Stunt
NEW YORK – A snowboarder performing a stunt for David Letterman’s late-night TV show veered off a ramp on a Manhattan street and fell 25 feet to the ground Thursday.
The woman, snowboarding champion Tara Dakides, was taken to a hospital and was listed in stable condition, said “Late Night with David Letterman” executive producer Rob Burnett.
Witnesses said the 30-year-old snowboarder made two successful jumps on the U-shaped ramp, set up outside the Ed Sullivan Theater, and then fell off the ramp after landing a third time.
“She came down at an angle and she just went off the side of the ramp and landed on her back,” said Dave Riddle, a tour bus driver from Orlando, Fla.
The CBS show regularly tapes stunts on the streets outside the studio. Because of the accident, the “Late Show” stopped taping and planned to air a repeat episode Thursday night.
Dakides, nicknamed the Terrorizer, has finished first in several X Games events, according to the site.