In case you did not believe our claims that discofinger is integral to Bollywood, check out this amazing video.
In this article about Bollywood aerobic dance moves, much attention is given to the discofinger. "Pointing: Disco-inspired. Index fingers of both hands point with the rest of your fingers curled. Arms extend toward the ceiling or toward the floor, either alternating or together to the rhythm of the tabla hand drums. Often the movement is a literal interpretation of the Hindi lyrics of Bollywood music. For example, the singer may be referring to the heavens, so dancers point upward."
A more recent take on the Bollywood discofinger has an impressive discofinger silhouette at 2:12.