I Love Lucy - Season 4 - Eps 22: Bull Fight Dance
Lucy literally blackmails Ricky into getting her a part in one of his guest appearances on television. He does get her a role -- as a bull. When Lucy is displeased with the turn of events, she transforms the bull's image from that of a snarling beast to a mincing creature resembling Elsie, the Borden Cow. Look for the classic scene where Lucy upstages Ricky in this episode.
About I Love Lucy

Title: I Love Lucy
First Air Date: 1951-10-15
Last Air Date: 1957-05-06
Status: Ended
Rating: 7.9/10 (from 226 votes)
Language: EN
Seasons: 7
Total Episodes: 180
Network: CBS
Genres: Comedy, Family
Production Companies: Desilu Productions
Synopsis
Cuban Bandleader Ricky Ricardo would be happy if his wife Lucy would just be a housewife. Instead she tries constantly to perform at the Tropicana where he works, and make life comically frantic in the apartment building they share with landlords Fred and Ethel Mertz, who also happen to be their best friends.
Cast

Lucille Ball
Lucy Ricardo

Desi Arnaz
Ricky Ricardo

Vivian Vance
Ethel Mertz

William Frawley
Fred Mertz