Uh Uh Uh

Simon: "Miles, that's my puzzle. You can't play with it."
Miles: continues to grab for Simon's puzzle and frantically shoves the pieces in his mouth.
Simon: "uh, uh, uh"
Me: "Simon, Miles can play with the puzzle because you left it on the floor."
Simon: "No he can't. I said uh, uh, uh".