Red carpet interviews are always a strange place for both celebrities and reporters, primarily because they're usually so fast-paced and it's basically just a soundbyte is all you're getting.
In this instance, a reporter from AP asked a relatively standard question about the recent passing of Sam Shepard, whom Matthew McConaughey had worked with on 2012's Mud. The only problem, however, was that McConaughey didn't realise Shephard had died.
It's a tough moment, watching someone immediately process the passing of a colleague they clearly respected and admired, and then have to maintain a veneer in a situation like a red carpet or a press line.
That said, McConaughey's a professional and dealt with it like one. Take a look.