They say it's a good idea to open with a joke.
Last night as I was putting J to bed, E (who goes to bed half an hour earlier than his big brother in order to avoid EPIC! NIGHTTIME! BATTLES!) rolled over in his bed and whispered "Mommy?" "Go back to sleep, honey." "Knock knock!" Sigh. This could go on all night. "Who's there?" "I love you." "Aw, I love you who?" Long pause. "Poopbutt."
The punchline could use some work.