Jerry Seinfeld speaks to Time magazine on the difference between writing and acting:
'If you read something somebody else wrote, no matter how well you read it, you didn't think of that,' says Seinfeld. 'I once had a bit I was going to try and do. I love when people talk about movies, they go, "Oh, I loved when Brad Pitt said . . ." No, no, no, no, no. Brad Pitt didn't say anything. They told Brad Pitt what to say. Brad Pitt said, "Is the masseuse here?" That's what Brad Pitt said.'"
Read the whole thing.