WHAT did he yell at the doctor?
umm... spoiler alert? ...
After the kid loses his hair they go see a doctor who tries to explain his "hairem scarem" diagnosis. He asks the kid to scare him. Kid says "boo" quietly, doc says that's not good enough, so the kid yells a word at the top of his lungs...
I'm guessing he yelled "FAKER!" ...why would he yell that? ...what did you hear?
-"But you know what's on my mind right now? It AIN'T the coffee in my kitchen..."