Mona Lisa
The Mona Lisa was a famous painting whose subject had an enigmatic smile.
By 2019, the Crew of the Copper-Colored Cupids' Department of Art had “locked itself in twenty years ago to argue about some masterpiece’s goofy grin or something” as documented in Incident Report C019A, “Does Mona Lisa Know Something We Don’t?”. (PROSE: Plagiarism of the SavageMen)
In the 925th Universe, during the Interdimensional Pride Parade of 2022, Stardust the Super-Wizard briefly dealt with an attempted theft of the painting from the Louvre by deleting France altogether; it remained in a state of nonexistence for seventeen hours, until his teammates of the Super Besties Justice Squad persuaded him to “put it back” by threatening him with the Atom Smasher. (PROSE: A Series of Queer Events, A Series of Queer Events (2024 reedit))
In one universe, Leonardo Da Vinci had instead painted the Mona Ovunque, whose model was a version of Jenny Everywhere. (PROSE: Cleaning Day)