Why David Letterman once thought he would go to prison: Watch

Foul ball, indeed! David Letterman admitted that he once worried he might go to prison after he accidentally threw a baseball out of a 14th story window in New York City.

“Honest to God, it was the worst day of my television life and maybe the worst day of my life,” the former Late Night With David Letterman talk show host, 71, prefaced his story to Ellen DeGenereswhile appearing onThe Ellen DeGeneres Show on Thursday, March 21.

The one-time weatherman explained that he had been throwing baseballs with his producer Mary when one got away from him. “It went up and over and through the window. Of the 14th floor. Of the 30 Rock building.” he said. “And down below was Sixth Avenue … and the sidewalk. …. Well… you know … How many are dead?” he worried.

Letterman continued: “I’m stunned, and so I go over to where the window is and I’m just kind of hiding and looking down there, and there wasn’t really any commotion to speak of…”

“People were looking up,” Mary, who now works for Ellen, 61, corrected.

“People were looking up because shards of glass had rained down on the Avenue of the Americas,” the Indiana native conceded. “And I see a guy down there, and I can hear him say, ‘Hey, look, there’s Dave Letterman!’”

The comedian confessed that he feared mishap might end with him behind bars. “I thought, ‘Oh. I’m spending the rest of my life in prison,” he recalled.

In fact, the My Next Guest Needs No Introduction With David Letterman star was so scared, he sent an intern down to assess the damage.

Letterman’s team also had the building’s windows covered with a special glass to avoid future incidents. “The stuff you see at hockey games. It’s bulletproof,” he said. “Problem solved.”

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David Letterman through the years
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David Letterman through the years
NEW YORK - DECEMBER 12: Julia Roberts catches up with Dave on the Late Show with David Letterman Thursday Dec. 12, 2013 on the CBS Television Network. (Photo by Jeffrey R. Staab/CBS via Getty Images)
NEW YORK, NY - APRIL 02: David Letterman appears outside the 'Late Show with David Letterman' at Ed Sullivan Theater on April 2, 2014 in New York City. (Photo by Donna Ward/Getty Images)
MUNCIE, IN - NOVEMBER 26: David Letterman attends 'A Conversation With David Letterman And Oprah Winfrey' at Ball State University on November 26, 2012 in Muncie, Indiana. (Photo by Ron Hoskins/Getty Images)
NEW YORK - APRIL 3: Actor Johnny Depp chats with Dave about his new movie 'Transcendence' on the Late Show with David Letterman Thursday April 3, 2014 on the CBS Television Network. (Photo by Jeffrey R. Staab/CBS via Getty Images)
LATE NIGHT WITH DAVID LETTERMAN -- Pictured: (l-r) Comedian Jay Leno, host David Letterman -- (Photo by: NBC/NBCU Photo Bank via Getty Images)
LOS ANGELES - JUNE 25: Marine Lance Cpl. William Kyle Carpenter, recipient of the Congressional Medal of Honor, is welcomed to the Thursday CBS Late Show by host David Letterman. (Photo by John Paul Filo/CBS via Getty Images)
NEW YORK - JULY 30: Jay Carney and Late Show host David Letterman discuss White House press briefings during Wednesday's 7/30/14 taping in New York. (Photo by John Paul Filo/CBS via Getty Images)
NEW YORK, NY - AUGUST 20: 'Late Show with David Letterman' host David Letterman plays a tennis match against Serena Williams at Ed Sullivan Theater on August 20, 2014 in New York City. (Photo by Taylor Hill/FilmMagic)
THE VIEW - 5/12/14 After 17 incredible seasons and 10 different female panelists, Barbara Walters says farewell to live daily television with her final co-host appearance this week on 'The View,' the daytime program she created for ABC. 'The View' airs Monday-Friday (11:00 am-12:00 pm, ET) on the ABC Television Network. Today's special guests include David Letterman, Michael J. Fox and guest co-host, Jane Fonda. (Photo by Lou Rocco/ABC via Getty Images)
NEW YORK - APRIL 22: Stephen Colbert, future host of the LATE SHOW, talks to David Letterman when Colbert visits the LATE SHOW with DAVID LETTERMAN, Tuesday, April 22 (11:35 PM-12:37 AM, ET/PT) on the CBS Television Network. (Photo by Jeffrey R. Staab/CBS via Getty Images)
NEW YORK - MAY 5: Peyton Manning and Late Show host David Letterman try their passing skills at moving New York City cabs with open windows during Monday's taping 5/5/14 in New York. (Photo by John Paul Filo/CBS via Getty Images)
NEW YORK - APRIL 22: Stephen Colbert, future host of the LATE SHOW, talks to David Letterman when Colbert visits the LATE SHOW with DAVID LETTERMAN, Tuesday, April 22 (11:35 PM-12:37 AM, ET/PT) on the CBS Television Network. (Photo by Jeffrey R. Staab/CBS via Getty Images)
NEW YORK, NY - APRIL 02: Talk Show Host David Letterman is seen on April 2, 2014 in New York City. (Photo by DVT/Star Max/GC Images)
Kennedy Center Honoree comedian and late night talk show host David Letterman arrives for an event in the East Room of the White House December 2, 2012 in Washington, DC. Obama and US First Lady Michelle Obama attended the event at the White House with the 2012 Kennedy Center Honorees before to celebrate their contribution to the arts before heading to the Kennedy Center for the honors program. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Actor Dustin Hoffman (L) chats with comedian and late night talk show host David Letterman during an event in the East Room of the White House on December 2, 2012 in Washington. US Presidenmt Barack Obama and First Lady Michelle Obama attended the event at the White House with the 2012 Kennedy Center Honorees to celebrate their contribution to the arts before heading to the Kennedy Center for the honors program. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
THE TONIGHT SHOW STARRING JOHNNY CARSON -- Pictured: (l-r) Announcer Ed McMahon, guest host David Letterman in the 1970s -- (Photo by: Gary Null/NBC/NBCU Photo Bank via Getty Images)
NEW YORK - NOVEMBER 13: Stupid pet tricks with Late Show Host David Letterman on Tuesday, Nov. 13, 2012 on the CBS Television Network. (Photo by Heather Wines/CBS via Getty Images) *** Local Caption)
NEW YORK - APRIL 17: Late night talk show host Conan O'Brien chats with Dave when he visits the Late Show with David Letterman, Thursday May 17, 2012 on the CBS Television Network. (Photo by Jeffrey R. Staab/CBS via Getty Images)
NEW YORK - MARCH 19: First Lady Michelle Obama talks with Late Show host David Letterman during Monday's 3/19/12 taping in New York. (Photo by John Paul Filo/CBS via Getty Images)
NEW YORK, NY - SEPTEMBER 11: David Letterman jokes around with photographers at 'Late Show with David Letterman' at Ed Sullivan Theater on September 11, 2014 in New York City. (Photo by Taylor Hill/WireImage)
THE TONIGHT SHOW STARRING JOHNNY CARSON -- Pictured: Guest host David Letterman on March 26, 1979 -- Photo by: Paul Drinkwater/NBC/NBCU Photo Bank
American comedian and television show host David Letterman, circa 1980. (Photo by Maureen Donaldson/Getty Images)
Host David Letterman and tennis player Maria Sharapova during a taping of 'Late Show with David Letterman' at the Ed Sullivan Theater on April 21, 2008 in New York City. (Photo by Joe Kohen/WireImage)
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