4x97 - Mr. Bean: The Animated Series

Mr. Bean is feeling down when everyone forgotten his birthday. When Bean learns that Mrs. Wicket is having a birthday party downstairs, he decides to crash it but the bouncer guarding the room refuses Bean's entry as he has no invitation from Mrs. Wicket. Bean soon finds his invitation card, which was hidden below the mat all the time, and thus is allowed to enter, only find that the party had just finished.