1. The Joker’s Clap – The Dark Knight (2008)

Heath Ledger committed fully to his Joker role. His unscripted clap while in the Commissioner Gordon promotion scene told it all as he began to clap slowly with an expressionless yet menacing face. It wasn't in the script but it was one of the film's great moments, which brought more dimensions to his character who was unpredictably crazy. Ledger's improvisation showed how he actually understood the mind of the Joker, and so what would seem like a trivial reaction turned out to be part of cinematic legend.
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Edited by Zainab Shaikh