VIDEO : Will Smith Performs 'Summertime' on The Late Show with Stephen Colbert

On Tuesday night's episode of The Late Show with Stephen Colbert, Will Smith took it back to his old-school days. Just as Colbert announced a commercial break, the show's house band?Jon Batiste and Stay Human?began playing Smith's classic "Summertime," which the Fresh Prince released with DJ Jazzy Jeff in 1991. Upon hearing the classic intro, Smith switched into rapper mode, abandoning Colbert's desk and grabbing a mic before launching right into the song's first verse. The crowd instantly jumped to its feet and started clapping along to the impromptu performance.