Simpsons on Tracy Ullman: Ep 1 Good Night

As Marge and Homer say goodnight to the kids, Bart philosophically ponders the workings of the mind, Lisa fears bed bugs will eat her, and Maggie listens to Marge singing, only to be traumatized by the lyrics.
The very first time the Simpsons ever appeared on TV.

From the Tracy Ullman show.

First aired April 19, 1987.