New Bully on the Block / Phoebe Breaks a Leg - S5-E5
Corrected entry: After Phoebe puts hinges on her cast and Helga and Phoebe are in the library. After Phoebe gets away from Helga and hides within the library shelves, she opens her cast and starts scratching her leg. When Arnold sees Phoebe he says to her, " I just saw you open and close your cast." Yet Phoebe never closes her cast.
Correction: He was just trying to say her cast couldn't be real and was also thinking of the fact that if she could snap the cast open she can snap it shut too. Any human in real life might say "open and close" when all they saw was the cast getting opened.