In 2017, FC Barcelona played against Juventus in the UCL quarter finals. During the match, Messi collided with Pjanic while trying to take a header, and this happened.
Yesterday, Juventus played against Parma Calcio, and Ronaldo tried to copy Messi again. Here is the proof.
This is not the first time, of course. As today, 4 years ago Messi did his iconic celebration against Real Madrid. Ronaldo took his revenge during the next El Clasico in the Spanish Super cup, when he imitated Messi after scoring a spectacular goal, which led Real Madrid to win the cup.
Whatever one does, the other has to do it as well. This is why this rivalry will go down in history. Yes, even even both of them fell flat on their faces.