Okay so this one time Julie did something and don't ask me what cuz I don't know but she did something that pissed Luis off. So Luis snuck into the girls restroom and wrote shit about Julie on the stalls.
"Julie Gaffney is the nastiest skank bitch I've ever met. She stays smelling like fish"
Julie of course sees it and tells the ducks about but they never find out it's Luis.