Martin Shkreli at Thursday’s House Oversight and Government Reform Committee hearing in Washington. (Joshua Roberts/Reuters)

You never know what Martin Shkreli is going to say, but it’s a safe bet that he’ll be smirking as he says it.

On Thursday, the much-reviled former chief executive of Turing Pharmaceuticals appeared before Congress where he, in fact, said very little: The “Pharma bro” refused to answer questions during a House hearing on drug prices, though he later insulted the lawmakers who asked them.

But if you watched the exchange on mute (or, frankly, even with the sound on), you might have thought that Shkreli was enjoying himself.

As he invoked his Fifth Amendment right against self-incrimination for the third time — just a few minutes into his appearance on Capitol Hill — he dropped his solemn countenance and flashed something familiar: his trademark smirk.

Since gaining notoriety last year for hiking the price of an AIDS drug, Shkreli has become known for delivering insolent and remorseless public statements, often matched by that characteristic smile.

The New York Post called him “Smirky Martin Shkreli.”

“Smirking drug executive antagonizes lawmakers after pleading the Fifth,” the Hill said in a headline.

​”Martin Shkreli smirks at Congress,” the Verge said.

The upturned edges of Shkreli’s mouth — sometimes coupled with a “Who, me?” eyebrow arch — hint at a public rage-inducing smugness. Indeed, Shkreli has become a reviled symbol of corporate greed, symbolized by that smug smirk.

Not sure what we mean? Below, we’ve rounded up just a few photos of his distinctive smirk.

(Brendan Smialowski/AFP/Getty Images)

(Brendan Smialowski/AFP/Getty Images)

(Mark Wilson/Getty Images)

(Mark Wilson/Getty Images)

Shkreli and his attorney, Benjamin Brafman, after a court appearance in New York on Wednesday. (Seth Wenig/AP)

Shkreli after a court appearance in New York on Wednesday. (Seth Wenig/AP)

(Seth Wenig/AP)

(John Taggart/European Pressphoto Agency)

(Seth Wenig/AP)

Shkreli seen Tuesday on “Mornings with Maria Bartiromo” on Fox Business Network. (Richard Drew/AP)

Activists hold signs with Shkreli’s smirking visage in front of the building that housed his former company’s offices in New York. (Craig Ruttle/AP)

Shkreli’s face is seen in a makeshift cat litter pan at an October protest in New York. (Craig Ruttle/AP)