VIDEO : Jimmy Fallon Interviews Donald Trump as Donald Trump

Donald Trump clarified, sort of, a long-standing question about his personality during an appearance on Friday's Tonight Show. Host Jimmy Fallon asked him, playfully, if the billionaire developer and GOP presidential front-runner has ever apologised for anything. The famously self-assured Trump replied before winning the studio audience's applause, "I fully think apologising is a great thing. But you have to be WRONG. ... I will absolutely apologise sometime in the hopefully distant future if I'm ever wrong." Trump's interview session with Fallon was remarkably similar to a comedy sketch that had Fallon impersonating Trump, complete with orange wig, as they faced one another on opposite sides of a picture frame, as if one of them were the other's mirror image.