A new lawmaker was upstaged by his own son at his swearing-in photo op on Tuesday when the youth performed the 'dab' dance in the background - to the irritation of Speaker Paul Ryan.

Kansas Rep. Roger Marshall, fresh off a primary victory over Tea Party-backed Rep. Tim Heulskamp, was to be pictured with Ryan and his family, including son Cal, who was in the center of the photo, holding a Bible.

After some brief chit-chat the group looked toward the photographer - with the exception of Cal, who hid his face in the crook of his elbow in true 'dabbing' style.

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Shut up and dance: Cal Marshall upstaged newly minted Representative dad Roger on Tuesday when he performed the 'dab' dance in the background of the pamily's photo op

World's greatest dab: Rep. Marshall was looking at the camera as Speaker Paul Ryan told Cal to lower his arm, leading the father to think his own hand was covering his wife's face

Say sneeze! Ryan lowered the laughing youth's arm as Marshall looked around and saw what was happening, covering for his son by saying that Cal had been about to sneeze

'You alright?' the Speaker asked him. 'It's just too ...'

As the teen maintained the pose, Ryan once again pressed his case, determined to get the photo done properly.

'You wanna -- can you put your hand down?' the Speaker asked.

Throughout the exchange, Marshall, who was looking away from his son and towards the camera throughout, appeared to think he was the one at fault.

'Is my hand in the way?' the new lawmaker asked through an uncomfortable grin, wanting to make sure not to block his wife's face.

Ryan ended the farce when he gently pushed Cal's forearm down.

'Okay, okay, I'm sorry,' the youth responded with a grin.

'You gonna sneeze? Is that it?' Ryan ribbed him as Rep. Marshall finally looked around.

'He's sneezing,' the elder Marshall said, covering for his son as the photographer snapped away.

Snap happy: The photo was eventually taken with everyone looking at the camera - even Cal. Ryan told the teen not to worry about it afterward

Dad's army: Cal and the rest of Marshall's family had been more on-message in earlier appearances, such as this pre-election flyer that helped him take the Kansas seat

Sporting chance: When he's not targeting his dad with pranks, Cal is a fan of archery (left) and football (right), playing for the Great Bend High School Panthers

Kidding around: Ryan made light of the incident on Twitter Tuesday night, saying that though he met 'countless' kids that day, he never figured out what dabbing was

'Don't worry about it,' Ryan told the teen when it was all over.

And on Twitter Tuesday night, he made light of the incident, writing: 'Just finished swearing-in photos. Nearly 300 members. Countless cute kids. Still don't get what dabbing is, though.'

Cal also referenced his prank on Twitter, retweeting a link to an article titled 'There will be no dabbing in Paul Ryan's Congress' with the message: 'I did not think this would happen.'

The youth, who plays on the Great Bend High School Panthers football team also retweeted a friend's comment, 'You are my hero,' with the remark 'Changing lives.'

Cal's brother Matt was similarly amused, posting a video of the embroglio on his Facebook page.

But their father, an obstetrician who had the backing of the Kansas establishment in his primary, got the last laugh.

He tweeted: 'Just so you know @SpeakerRyan: He's grounded.'

Fame and misfortune: Cal seemed pleased with his infamy, sharing his appearance on Twitter's 'Moments' with his followers

Ground down: Marshall later tweeted Ryan to let him know that his son had been grounded for his mischievous prank

'Dabbing' became something of a phenomenon over the course of the past two years.

Sports Illustrated wrote about the 'dab' after Carolina Panthers quarterback Cam Newton performed it after scoring a touchdown against Tennessee in 2015.

Cleveland Cavaliers star LeBron James is among those who have publicly dabbed.

If Ryan felt like he was losing control of the group on an important day, it wasn't the only time.

House Republicans had to abandon a rules change that would have gutted a key ethics oversight office on Tuesday – after voting in the change just the day before.

Ryan had urged against the change on Monday, to no avail.