Thanos: I am… inevitable. (snaps his fingers and nothing)
(Tony has all the Infinity stones now…)
Tony Stark: And I… am… Iron Man. (snaps his fingers)
From the movie Avengers: Endgame (2019)
This quote comes from the iconic dialogue between Thanos and Tony Stark from Endgame. Tony uses Thanos’s favorite line against him. Iron Man then snaps his fingers and defeats Thanos.