In Hermione Granger's sixth year, the biggest frustration of her entire life was the unfortunate rumor that Harry Potter was gay and also possibly building a harem from the worst possible candidates in the entire Hogwarts. It was either that, or he had been infected by a vicious population of creatures commonly known as Snazzleworg, which was known to change your sexual preference.
This idea had quietly slipped into the witch and wizards-in-training during the end of fifth year and slowly built up over summer, parasiting off many's peace of mind.
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Kid: "Dad, Mom, the guy I like is gay."
Dad: "Don't worry, sweetheart. I know a chap that can perform a sex-change operation. He'll give you a discount!"
Mom: "Honey!"
Kid: "How much does it cost?"
Dad: "Ahahaha- Wait, you're serious?"
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Kid: "Dad, Mom, the guy I like is gay."
Dad: "Well, I know how to make/do a sex-change potion/spell. I'll give you a discount!"
Mom: "Honey!"
Kid: "How much would it cost?"
Dad: "Ahahaha- Wait, you're serious?"
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Kid: "Dad, the guy I like is gay."
Dad: "Would you like me to check his head for Snazzleworg? They are parasites that inhabit a person's crown and are known to change a person's sexual preference. Additionally, they..."
Kid: "I was kind of hoping you knew a spell or potion that could change my gender?"
Dad: "But the possibility that your future boyfriend has a case of Snazzleworg is most likely, especially since I heard that there's been a recent outbreak and..."
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Kid: "Dad, Mom, the guy I like is gay."
Dad: "Well then, isn't that good for you? What do you expect me to do?"
Kid: "I was hoping you knew where to buy a love potion, since it's apparent that I might actually have a chance with Harry now."
Dad: "You should know a better method than... WAIT, YOU'RE SERIOUS!?"
Mom: "Lucius!"
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And et cetera. The rumor only thickens.