The host told LeBlanc, 47, he really enjoyed the musical moments in the long-running series including one scene when his goofy but lovable character Joey performed in a musical about the life of Dr Sigmund Freud.
"I think it was right in the very beginning of the first season, like episode four or something," LeBlanc explained. "It was called Freud."
Then he remembered an episode from the fifth season where Joey encounters his identical hand twin, reported E! Online.
"This hand is your hand, this hand is my hand, No wait that's your hand, Oh no that's my hand!" LeBlanc hummed.