I Love Lucy: Lucy Tells the Truth (1953)

Ricky (Desi Arnaz), Fred (William Frawley), and Ethel (Vivian Vance) bet Lucy (Lucille Ball) one hundred dollars that she can't tell the truth for 24 hours. Determined to win her bet, Lucy manages to offend all of her bridge-playing friends by refusing to coddle them with her usual little white lies. The acid test comes when Lucy is forced to reveal her true age -- and worse, her true weight. In typical I Love Lucy fashion, the situation is resolved in a burst of hilarious physical comedy, as Lucy is obliged to prove her self-proclaimed show-business talents by appearing at the wrong end of a knife-throwing act! ~ Rovi