breakfast in bed

An elder couple was lying in bed after they awakened just chatting.
The husband suggested whomever thought of the best rhyme could get
breakfast in bed. She thought a bit and said: "Ok, shoot."

He thought for a bit and then said: “2 and 2 are 4, 4 and 5 makes 9,
I've got my hand on yours, you've got your hand on mine.†She thought
a bit then said: "2 plus 2 is 4, 4 and 5 makes 9, I know the length of
yours, you don't know the depth of mine."