@sebastianhoward64,
We misperceive all kinds of things in all kinds of situations. Think of unreliability of eyewitness accounts. As Setanta said, paying close attention to what you're reading can lessen the odds of misreading. Frequently, while skimming the newspaper, I'll misread a headline, see a word that's not the actual word, or pause at the wrong place, with the wrong emphasis or an alternate pronunciation..
Picture puzzles are a rich source of ambiguity. Which is the negative space, which is the figure. We can all be our own unreliable narrators.