It's Bert at the door, and not his Aunt Matilda.
Aunt Matilda is Bert's aunt, who has been mentioned in several Ernie and Bert sketches.
On separate occasions, her name has been spoken in jest by Bert when Ernie asks if it was really him knocking at the door ("No, it was my Aunt Matilda -- yes, it was me!"), had her birthday mistaken by Bert when trying to guess Ernie's surprise, and had her gift opened by Ernie.
In the latter case, Ernie finds a present in the apartment, and tries to guess what Bert is giving him. Ernie guesses that the present might be a football, a cake, or a reading lamp. When he's told that his guesses are wrong, Ernie excitedly unwraps the box. The present turns out to be a pink pillbox hat, with flowers and a veil, which Ernie commandeers. When Bert tries to explain that the hat was intended for Aunt Matilda, Ernie expresses surprise that he bought them both the same gift then prances out sporting the chapeau.
Other Aunts[]
- Grover has an Aunt Mathilda of a different spelling.
- Bert's pet pigeon Bernice has an Aunt Matilda who resides in Brooklyn, as revealed in a 2004 sketch.
- Hoots the Owl has an Aunt Matilda, according to Episode 2209.
- Gabi's Aunt Matilda is mentioned in Episode 3442.