Robert De Niro is legendary for his intense method acting.

But few know just how far he’s gone to embody a role.

For “Taxi Driver” (1976), he actually worked 12-hour shifts as a New York cabbie.

He drove incognito, picking up real passengers to understand Travis Bickle.

For “Raging Bull” (1980), he didn’t just act like boxer Jake LaMotta—

He trained as a real boxer for nearly a year.

De Niro even entered three actual matches—and won two.

To play LaMotta’s later years, he gained over 60 pounds, shocking the crew.

The weight gain caused breathing issues, but he insisted it be authentic.

For “The Untouchables,” he wore silk underwear—even though it was never seen—

Just to feel like Capone would.

In “Cape Fear,” he spent thousands to grind his teeth into a menacing snarl.

Then paid more to get them fixed afterward.

His commitment impressed directors and terrified co-stars alike.

Martin Scorsese once said, “He doesn’t just play the part—he disappears into it.”

Even for minor roles, De Niro dives in with full intensity.

He learned Sicilian for “The Godfather Part II”, speaking it fluently on screen.

That dedication earned him an Oscar—for just 17 minutes of dialogue.

De Niro doesn’t act; he transforms.

And in doing so, he’s turned performance into a kind of psychological alchemy.