Mike Krzyzewski Lovingly Says 'F--k You' to Kyrie Irving at Team USA Practice

Warning: Video contains NSFW language.

It's rare to hear Duke Blue Devils coach Mike Krzyzewski drop any major profanities on camera, but there are moments during games and practices where he slips up from time to time.

Thanks to the power of "mic'd up," a humorous moment between a coach and his player was captured.

During a recent Team USA practice, Coach K was breaking down a play and giving pointers when former Blue Devil Kyrie Irving apparently decided to mess around with his college coach—because the relationship they have built through the years allows them to have some good-natured fun.

Krzyzewski's response to Irving's antics? A loving "f--k you." And a second one.

Good friends, good times.

[Instagram]