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.