Republican leaders were making a solemn pledge to repeal Obamacare during a press conference on Capitol Hill Jan. 4, when House Speaker Paul Ryan made a slip of tongue that sent the group erupting in laughter.

Ryan was passionately saying that “We know that things are only getting worse under Obamacare,” shortly before he almost called vice president-elect Mike Pence “vice president-elect Trump,” to introduce Pence to the audience.

His fellow Republicans apparently found the gaffe hilarious. When Reuters photographer Jonathan Ernst captured this moment, Ryan is grimacing at his own mistake, as Pence laughs candidly.