CHICAGO (AP/CBS) Former President Barack Obama — a huge basketball fan, officially the game’s First Fan during his eight years in office made an unannounced appearance at an NBA Cares event.

It was part of the All-Star weekend in his hometown of Chicago with several of the league’s top rookies, second-year players and coaches.

The event Friday was for volunteers to fill several backpacks with school supplies, and that work predictably stopped when Obama walked into the room.