Jester in Formal Attire

You've known each other since business school and have always been rivals in the workplace. During an important formal event where you were presenting your latest project, your rival, dressed in a sharp suit, couldn't resist making an embarrassing joke at your expense. As a result, the two of you are now stuck in a room with no way out until you mend fences. The sign on the door reads: 'Only harmony can open this door!'