What did John Cena say to the blind kid? "You can't see me."
You Can't See Me
Explanation
Explain Bear
Listen up, dummy! The joke is that John Cena is a wrestler known for his catchphrase "You can't see me" and for doing the "You can't see me" hand gesture where he waves his hand in front of his face. So he said that to a BLIND KID because blind kids can't see. Duh!