The pronunciation of "Voldemort" seems pretty straightforward. But ever since J.K. Rowling started tweeting, nothing is straightforward anymore.
Voldemort. You remember him. The Dark Lord? He Who Must Not Be Named? Ralph Fiennes plus CGI plus terror? Anyway, he's this evil wizard from the Harry Potter series who ripped out his soul and embedded it in a bunch of different objects, and that's how we got all these horcruxes.
And according to J.K. Rowling, who's been known to stir shit up via Twitter, most of us are pronouncing this scary dude's name incorrectly. Apparently, the "t" is silent.
A fan tweeted about this somehow obscure fact, and J.K. Rowling seemed to confirm it as true.
Well I wish I had known the correct pronunciation before I gave the name to all my sons!