Conan O'Brien Says David Letterman Once Gave Him a Horse Named Dave as a Thank You Gift

David Letterman doesn't horse around with this thank you gifts. Conan O'Brien revealed that in 2015, as Letterman prepared to retire from late night television, O'Brien penned a touching tribute for the comedian-- and Letterman returned the favor by gifting O'Brien a horse named Dave. "As he was departing this stage I wanted to write an appreciation piece," O'Brien, 54, explained to Stephen Colbert on Friday's episode of The Late Show. "And then word came back that Dave appreciated what I had wr...