Commander Shepard was never much of a prankster. He tends to be a quiet guy who is quite passive. All this means is that it’s a great setup for a prank as no one on the team will expect it. On April 1st before the Jets game Shepard was his usual self focused, and picturing the game beforehand in his head. The game went on as usual with Shepard's normal defensive game. But about half way through the 2nd period Shepard stood up on the bench and randomly said “THE CITADEL IS CALLING ME I MUST LEAVE NOW!” he then sprinted off the bench and into the locker room. His teammates were in shock. They always knew he was a space marine from the future but never anticipated him being called back into service. But much to their amusement he came back right as the commercial break ended and everyone in the arena and on both benches had a good laugh.