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Mavericks fans saw a side of Dirk Nowitzki on Monday night that isn't always on display.

Angry Dirk.

A second-quarter foul called on Utah's Joe Ingles (guarding Dirk in what had already been a physical game) led to him voicing a complaint with an official. Dirk then approached the Jazz big man to exchange some words. The two had to be separated.

You can see the foul below, which was followed by double technical fouls applied to both sides.

Dirk lights up Joe Ingles after foul, leading to double techs https://t.co/TF2AaM1Kzt https://t.co/l7A71cyfzt — Tim Cato (@tim_cato) April 12, 2016

Dirk Nowitzki just got right in Joe Ingles' ear to tell him something about the physical play that has dominated this game. Double-techs. — Eddie Sefko (@ESefko) April 12, 2016

Haven't seen @swish41 that mad since Warriors Shaun Livingston did this to him last April. https://t.co/1EFexEOgWw — Brad Townsend (@townbrad) April 12, 2016

Dirk and Joe Ingles have to be separated. It's getting heated. #DALatUTA — Earl K. Sneed (@EarlKSneed) April 12, 2016

We're sure Dirk was more than cool by the night's end, though. He finished with 22 points on 7-for-12 shooting (4 for 4 at the free-throw line). Oh, and it only helps that Dallas clinched its 15th playoff berth in 16 years last night, too.