Based on Arthur's Big Hit.
Walter: I told you not to touch it!
Candace: You built it all wrong! Did you read the directions? It didn't fly for one second! It's not my fault that you made a plane that can't fly...
Walter: I told you NOT...TO...TOUCH IT!
(he punches Candace)
Walter's mom (off-screen): Walter Nicholson, get over here right now!
Walter (guilty): Uh-oh, last name.