Stephen Colbert And Conan O'Brien's Late Night Dance-Off (VIDEO)

Stephen Colbert made a surprise appearance last night on "Late Night" to challenge Conan O'Brien to a dance off.

Last week on "The Colbert Report," Stephen announced he had stolen O'Brien's invisible strings (the ones Conan uses to do his pocket dance) in order to stop his friend from leaving for LA to take over the "Tonight Show." Conan was unhappy with that assertion and was in the midst of talking some smack about Colbert, when the man himself sauntered on stage.

What followed was the greatest display of invisible string dancing the world has ever seen.