David Letterman Grills Kevin Durant At Nets Media Day, ‘Why Do People Call You KD?’

Late-night legend David Letterman crashed the Brooklyn Nets’ media day on Monday … and it was bad news for Kevin Durant, who was interrogated with a ton of tough questions!!

The former longtime “Late Show” host kicked off his round of Qs for the 2-time champ with quite possibly the hardest-hitting question in sports journalism — asking about Durant’s “KD” nickname … which, of course, has always been a big mystery among fans.

“Why do people call you KD??” Letterman asked.

Durant explained the reasoning behind the moniker with unenthusiastic delivery … and you gotta give him credit for having the patience to walk Letterman through that toughie.

Letterman had more fire for KD … asking how much effort he was going to put out on the court this season … to which he replied, “110%”

The best question came when DL asked if KD would consider playing for the Nets AND Knicks at the same time … but that’s when Durant’s patience ran out.

“All right, Dave, that was the last one,” he said … before adding, “They let anyone in here.”