"Is this the D train?", an Anything Muppet man asks to a woman on the subway. His question is answered when a train stops and letter Ds exit.
Ernie comes from finishing his bath, and tells Bert that there's something that he forgot. Bert asks if he's washed behind his ears, his neck, and his elbows. Finally, Ernie remembers that he forgot to turn off the water in the tub -- as the water level rises.