Congressman's son dabs during swearing-in photo with Paul Ryan

WASHINGTON DC -- After House Speaker Paul Ryan officially swore in the 115th Congress Tuesday, he began an hours-long photo op with members and their families.

Newly-minted Rep. Roger Marshall, a Kansas Republican, posed with his family including his four children. One of the younger Marshalls decided to take full advantage of his front and center position by dabbing.

Dabbing is an upper body movement made popular by Carolina Panthers quarterback Cam Newton.

As you can see, Ryan didn't really get it. He admitted as much later on Twitter.

"Do you want to put your hand down?" Ryan said. "You gonna sneeze? That it?"

Rep. Roger Marshall tweeted to Paul Ryan that his son was grounded.