It's easy to say that Diane Chambers knocked Sam over when she first came into the bar. She was the intellectual and witty counterpart to Sam's womanizing and unromantic lifestyle. Her on-again, off-again relationship with him provided viewers with a heated and unpredictable ride during Cheers' first five years. But working at Cheers changed her as well, giving her a much-needed look at another side of life.
Diane is played by Shelley Long.