Someone once said the definition of insanity is doing the same thing over and over and expecting different results. These 2013 Yankees have put a twist on that: They’re doing the same thing over and over, and the rest of us are expecting different results. Yes, the Yankees, who keep dropping bodies onto their giant pile of casualties, are challenging our collective baseball sanity. Now it’s Andy Pettitte on the 15-day disabled list with a strained trapezius muscle, plus Chris Stewart dropped to backup catching responsibilities due to a left groin injury. And, predictably, the Yankees responded to those latest developments with a 5-0 trouncing of a laid-back-looking Blue Jays club at Yankee Stadium. “I think I take the approach ‘It is what it is,’ and we’ll find a way to get through the day,” manager Joe Girardi said at the day’s outset. They got through the day, ensuring they would maintain sole possession of the American League East penthouse, thanks largely to another stud-like performance from their second ace, Hiroki Kuroda, who threw eight shutout innings. Fielding a typically unimposing lineup that featured Jayson Nix hitting second and Ben Francisco hitting fifth, the Yankees cobbled together enough runs off Toronto veteran starter Mark Buehrle. Rookie catcher Austin Romine, who will get significant playing time with Stewart down and Francisco Cervelli (fractured right hand) out, delivered a single and double. Nix recorded two walks and two sacrifice flies, a rather productive 0-for-0 in his four plate appearances. Rookie David Adams singled, doubled and scored two runs. “We’re just excited,” Romine said of himself and his fellow contributing youngsters. “We’re excited to get a chance, excited to be here, excited to contribute.” Every day in Yankees land becomes a survival exercise. Before the game, infielder Alberto Gonzalez, whom the Yankees reacquired from the Cubs just last week, worked out as a catcher with bench coach/catching instructor Tony Pena — just in case Romine went down and Stewart’s groin acted up.