even the pros have fun...

Roger Federer apparently likes classical music... 

"It was his mother’s birthday, and he was in Rotterdam. They were playing the Beethoven violin concerto, a family favourite.

Roger Federer was not going to miss it. Nor were the players going to miss him. Here he is, coming backstage with Rotterdam Philharmonic managing director Hans Waege (left)"

short version:

long version:

via {slipped disc}