WASHINGTON — Maybe it was the pressure that made him revert to his grade-school self.

President Obama put on his silliest face Thursday for a woman snapping a smartphone photo of him at the White House. Obama mugged for the camera at an event to welcome injured veterans cycling in the Wounded Warrior Project’s Soldier Ride to the White House.

Obama made the face at spectator Nancy Lubin, of Bethesda, Md., who broke into laughter when confronted by the president’s goofy visage in her viewfinder.