NUCEAR-IRAN/MISSILES-USAMaybe it was a sign that someone wanted to put the press corps — or possibly the White House staff — in their place.

Who knows, but at the beginning of the daily White House press briefing on Wednesday, a disembodied voice sounded in the briefing room, saying: “THE PRESIDENT IS POWERFUL.”

Reporters and White House staffers in the room laughed, and White House spokesman Robert Gibbs joked about it, to more laughter. But no one offered an explanation for the pronouncement.

“Was that happening just in my head, or did you all — did you all hear that, too?” Gibbs asked.

“We didn’t hear anything,” someone answered.

“Wow. Wow. That’s — that was interesting, if inexplicable,” Gibbs said.