This episode page has been compiled from descriptions found in TV Guide.
Farley explains things one can do with their mind - he plans on going to the door, he imagines who's knocking at it, he remembers it's not his mother and he hopes there's not a scary monster at the door. Herry Monster surprises him by bursting through the door, frightening Farley away. Herry's sorry Farley ran away; he wanted to play.
Ernie lies in bed and starts talking about how a square looks like and how many lines it has, then goes on to compare a square with a triangle, then starts to ponder about how many sides a circle has. He goes to sleep just as Bert is about to attempt to answer the question, and Bert ends up not being able to sleep.