Emmy-winner John Mulaney had some explaining to do when, during a tour of Graceland with his Elvis-loving son, the boy asked if he could meet The King. Tickets to Mulaney's "Mister Whatever" standup comedy tour at https://www.johnmulaney.com. #Colbert #Comedy #JohnMulaney #MisterWhatever #StandUpComedy #ComedyTour #StephenColbert #TheLateShow Subscribe To "The Late Show" Channel: http://bit.ly/ColbertYouTube Watch full episodes of "The Late Show": http://bit.ly/1Puei40 Listen to "The Late Show