Never. I'm Scottish and therefore always right.
However, the English part of me is occasionally wrong.
Recall a couple of times in a row Larry J* corrected me on facts. Couldn't find better facts to best him, so conceded his point.
Made myself much better at getting facts right rather than parotting something I half heard on the radio or vaguely remembered from the internets.
*The irony of this, in this thread, is just toooooo much.......