What was the name of the episode where Lucy accidentally tells the truth?

What was the name of the episode where Lucy accidentally tells the truth? It was “Lucy Tells the Truth.”

The episode centers on a wager made by Ricky, Fred, and Ethel: they doubt Lucy can go an entire day without telling a lie. Lucy accepts the challenge and tries to be completely honest, expecting that truthfulness will prove how trustworthy she can be.

Instead, her blunt answers hurt everyone’s feelings. She criticizes Ricky’s singing, comments on Ethel’s appearance, and says things that are technically truthful but socially disastrous. The joke reverses Lucy’s usual pattern: rather than getting into trouble by exaggerating or inventing a story, she creates chaos by refusing to soften her opinions.

“Lucy Tells the Truth” is a third-season episode and is often remembered for its comic exploration of honesty, tact, and marriage. The title is sometimes confused with a plot description, but it is the episode’s canonical title—not “The Truth Serum” or another unofficial label.