Carmelo Anthony was just trying to casually throw down a dunk after a whistle like hundreds of players before him have done. Most of those dunks are forgotten seconds after they happen. Anthony's attempt is a bit more memorable.
Getting rim-checked during a game has to be among the most embarrassing things that can happen to an NBA player. Getting rim-checked so hard during a dead ball that you literally fall over is a new level of sad.
On the bright side, at least only one of his teammates on the bench started laughing.