I've been trying to come up with one for When Harry Met Sally, but the only Sallys I can think of aside from the actual movie by that title are Sally Forth (comics) and Jack Skellington's girlfriend from The Nightmare Before Christmas, neither of which suggest any crossover plotlines for Harry Potter besides the tired "kid Harry gets away from Durzkaban," or post-canon Harry replacing the nearly-nonentity husband in the comic strip and not really changing anything due to its nature.
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‎noli esse culus
‎noli esse culus