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Quilloughby is a singer and an imaginary friend that Lisa made.

After Lisa became addicted to listening to Quilloughby and The Snuffs, she tried to change the Springfield Elementary School lunch menu to include vegan mushroom tacos. However, after eating some, she found out that it contained bacon. When she rushed home, she begun to imagine Quilloughby. Lisa quickly bonded with her new imaginary friend who had a lot in common with her.

Quilloughby would tell Lisa what to say to other people to hurt them. Quilloughby told Lisa what to tell Bart to ruin him, with just one sentence. Afterwards, Quilloughby wanted to get out of the house as he was bored, so Lisa took him around town, where Quilloughby mocked everyone he saw. This entertained Lisa and then Quilloughby and Lisa started to sing "Everyone Is Horrid Except Me (and Possibly You)". Quilloughby being horrible to people, and getting Lisa to be horrible to people, got her in trouble at school, after she was mean to Mr. Largo. After this, Marge cancelled the Slapify subscription so Lisa could no longer listen to The Snuffs...