"I love MOO!"

Marinette just can't manage to say "I love you" to Adrien, even though he already knows she loves him and she knows he loves her. It elaborates on the degree she suffers from this by having her being just unable to finish off the sentence "I love you" while practicing in front of a picture of Adrien, causing her to going red in the face from straining to say "you" for multiple hours until it reaches around eight in the evening. She then attempts to bypass her limitation by printing out a picture of a cow so she can instead say "I love moo".

Example of:
Cannot Spit It Out