Not just the song but the whole performance of "Brotherhood of Man" in the 1967 movie HOW TO SUCCEED IN BUSINESS WITHOUT REALLY TRYING, based on the Broadway musical and starring much of the cast from the original stage production, in particular the sublime Robert Morse. There's something about this goofy song and dance number that gets me in the feels. The way the scene is blocked, the little bits of business in the scene and the way that all these men and one woman are willing to do anything, unashamedly make themselves look ridiculous, for the sake of the scene. I watch it very often and I'm always inspired. I think of this as humanity's greatest achievement.