It's especially ridiculous with the Brontes, i.e. the siblings who spent their childhood writing stories featuring all types of murder, war, adultery in all variations and madness galore. As for Wuthering Heights, just about the only autobiographical element anyone can detect is that Emily was familiar with living with an alcoholic, but that's it.
On the more hilarious side, I was always amused about the deliciously evil coincidence of Charlotte - who of course had no idea about London gossip in general and Thackeray's private life in particular - dedicating the second edition of Jane Eyre to Thackeray because he'd said such nice things about her novel, and him publishing Vanity Fair, which caused no small number of Victorian tin hats who had heard that Thackeray's wife had gone mad to conclude that the author of Jane Eyre must be none of other than a former governess of Thackeray's, whom he portrayed as Becky Sharpe but who wrote her version of their relationship as Jane/Rochester. If that's not a warning to the "but real life must have inspired writer x!", nothing is...
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On the more hilarious side, I was always amused about the deliciously evil coincidence of Charlotte - who of course had no idea about London gossip in general and Thackeray's private life in particular - dedicating the second edition of Jane Eyre to Thackeray because he'd said such nice things about her novel, and him publishing Vanity Fair, which caused no small number of Victorian tin hats who had heard that Thackeray's wife had gone mad to conclude that the author of Jane Eyre must be none of other than a former governess of Thackeray's, whom he portrayed as Becky Sharpe but who wrote her version of their relationship as Jane/Rochester. If that's not a warning to the "but real life must have inspired writer x!", nothing is...