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Oscar is a joke filler imaginary friend that appears in One False Movie.
After watching Coco's performance, Bloo says, "I smell Oscar!" which is a phrase used to congratulate someone on their performance. However, the camera then pans to an imaginary friend named Oscar with noticeable body odor, which he quickly becomes self-conscious about after Bloo had pointed it out.
Oscar makes another cameo in Let Your Hare Down.