The line comes from Martin Scorsese's 1976 film Taxi Driver, spoken by Robert De Niro as troubled taxi driver Travis Bickle while he rehearses a confrontation in front of a mirror. It quickly became one of cinema's most quoted moments, referenced in comedy, advertising and other films long before short-form video existed. In memes and short videos, the clipped question is now shorthand for mock outrage or a challenge, letting a creator answer an accusation with a knowing, cinematic stare rather than a lengthy explanation.