Episode 20 of "Futurama"
s02e11 Lesser of Two Evils

Fry, Leela, and Bender go to "Pastorama", a place made to look like the 20th century. While there, Fry runs over Flexo, a robot that looks exactly like Bender, except for his goatee. Soon Bender and Flexo become real good friends and Fry gets jealous. The Professor hires Flexo as extra security when the crew is asked to deliver a valuable Gumbonium atom on a tiara to the Miss Universe Contest. Fry suspects Flexo of wanting to steal the tiara, and sure enough, the tiara ends up missing. Fry tries to track Flexo down at the competition which is being hosted by Bob Barker. After a fight between Bender and Flexo, it's revealed that Bender had stolen the tiara all along. Bob Barker mistakes Flexo for Bender and has him arrested for the crime.