Episode Title:
Party of One.
Episode Description:
After inviting her friends to and throwing a birthday party for her pet alligator Gummy, Pinkie decides to throw a day-after party to continue the celebrations. She finds that her friends all seem to be busy. Suspicious of their behavior, Pinkie follows her friends and discovers that they are actively avoiding and hiding something from her in Applejack's barn. Pinkie becomes depressed, thinking the five no longer consider her a friend. She throws her own party using inanimate objects when Rainbow Dash retrieves her and brings her to a party at the barn. Pinkie thinks her friends are throwing a party to get rid of her, only to realize it is actually her own birthday party, which she had forgotten. Pinkie quickly becomes elated and joins the celebration with her friends.