Fallon explained that the giant green pickle came from David Letterman's era, which ended in 1993 when he moved to CBS. Letterman's writers passed it on to Conan O'Brien.
"He had it, and then he gave it to me," Fallon said of O'Brien. "And then I've been stuck with it for five years -- I mean I've been so blessed to have this thing for five years -- and so now, I would like to present it to you."
"Hold back the emotion," Fallon joked.