The line comes from Marvel's The Avengers in 2012, during a tense exchange aboard the Helicarrier. Captain America questions what Tony Stark is without his Iron Man armor, and Stark answers with the four word list that became his defining quote. The moment was widely clipped, quoted and turned into profile bios, fan edits and reaction posts across social media. Its lasting appeal is how neatly it captures Stark's wit and arrogance in a single comeback, so creators still reuse it whenever a confident character introduction is needed.