It annoys me when people put words into the mouth of somebody famous who’s no longer around to refute it.
For example, Mozart is often quoted as saying “Love is the soul of genius.” In fact, it was his best friend and student, Gottfried von Jacquin, who wrote in Mozart’s Stammbuch on April 11, 1787
Wahres Genie ohne Herz ist Unding — denn nicht hoher Verstand allein, nicht Imagination, nicht beide zusammen machen Genie — Liebe! Liebe! Liebe! ist die Seele des Genies.
And he was quoting Johann Caspar Lavater’s Physiognomische Fragmente.