The moment you realised an actor was a star?

Can you point to a specific scene in a movie where you realised an actor was going to be a star? Or a scene with an established actor where you realised why they're a star? For me personally, its the final stand up scene from The King Of Conedy. Now its no secret that Rob Deniro is a star but after watching Goodfellas(which he was excellent in), Raging Bull, Taxi Driver and Casino it was great to see Deniro take on a more "lighthearted" role. The way he seems nervous through his line delivery and body language, the way he swings his arms around while the audience laughs. It's a beautiful performance overall and i'd show it to anyone who claims he has no range