A big splash occurred on Monday morning at the House Press Gallery in the U.S. Capitol. No, this wasn’t one of those unexpected guest appearances for celebrities to talk to reporters about some favorite cause. This splash came from an exploding urinal. More specifically, something suddenly broke in the piping of the third-floor urinal, and water began spewing from beneath the men’s room door. As the water flowed, it first surrounded the Associated Press’s working area, then spread toward both ends of the gallery, which was occupied by fewer than usual reporters and staffers, because the House is out of...