Every Sunday, Boston Globe photographer Stan Grossfeld asks the subject of one of his photos to explain what's happening in the shot.

Who’s up today: Darnell McDonald, then playing right field for the Red Sox and now in town this weekend as a member of the Yankees, nearly tumbles into the Blue Jays bullpen after robbing Kelly Johnson of a home run in the ninth inning at Fenway Park, June 27, 2012.