As Joe Biden has aged, he’s developed a subtle but sure-fire tell to indicate when he’s lying: His lips move.

I’m literally, literally, literally serious, as Joe himself might put it. I’m not joking. I’m not making this up. This is not hyperbole.

So it was on Tuesday, when Biden told a crowd in Milwaukee that he watched a bridge collapse in Pittsburgh last year, honest and for true.

Biden was in Cheesehead territory to tout the smashing success of Bidenomics. He began, innocently enough, with an attempt at damage control for his incredibly callous “No comment” remark over the weekend when he was asked about the rising death toll from the wildfire in Maui. And then, as he’s wont to do, Biden wandered off script and began talking about last year’s Fern Hollow bridge collapse, which sent four people to the hospital.

“A lot of you were with me when I was in Pittsburgh,” he told the, er, crowd. “By the way, Pittsburgh is a city of bridges — more bridges in Pittsburgh than any other city in America.”

We somehow doubt that “a lot” of the paid attendees people there in Milwaukee also happened to be with him on that fateful late-January day in Pittsburgh, but when ol’ Joe gets rolling, you’d better believe the Germans bombed Pearl Harbor. “I watched that bridge collapse,” he continued. “I got there and saw it collapse with over 200 feet off the ground going over a valley. It collapsed. Thank God school was out during the — during the pandemic.”

Indeed, thank God for the blessed pandemic that killed more than a million Americans, and for the politicians and teachers unions that used it to rob our kids of years’ worth of education.

And thank God for Joe Biden himself, who enthralled Wisconsin Democrats with the tale of how he ripped off his sport coat, raced down the bank, dove straight into frigid Fern Creek, and singlehandedly raised up a span of the bridge to free the poor souls who’d been trapped beneath it. (Okay, we kid.)

Alas, as the Washington Examiner’s Paul Bedard helpfully corrected, Biden didn’t see any such thing: “He showed up hours later since he was in town on an infrastructure mission.”

From there, it was off to the next well-worn lie — this one about how an Amtrak conductor congratulated the then-vice president for having ridden more miles on the train than on board Air Force Two.

How do we know that the Amtrak story is a lie? Because the conductor, a man named Angelo Negri, retired from Amtrak roughly 20 years before Biden says the conversation took place.

Some might find this Walter Mittyesque self-aggrandizement endearing, but we tend to find it irritating. This is no doubt in part because the mainstream media lets him do it with impunity. Remember how he was “appointed” to the U.S. Naval Academy? How he graduated in the top half of his law class at Syracuse? How he was arrested in South Africa while trying to see Nelson Mandela? How he was arrested during the Civil Rights movement of the 1960s? How he used to drive an 18-wheeler for a living?

Lies, lies, and more lies.

But some of his lies are bigger and more awful than others. Like the one about how his first wife and daughter died. And the one about how his son Beau died.

Those lies are just plain sick, but they’re a fundamental part of who Joe Biden is.