George Clooney Starts Snowball Fight with Matt Damon | George Clooney, Matt Damon

Clooney (left) and Damon in Berlin

Splash News Online (2)

George Clooney Starts Snowball Fight with Matt Damon

Saturday March 23, 2013 01:30 PM EDT

All work and no play? Not for George Clooney.

The star proved getting a movie done can be plenty of fun if you've got your friends with you – and you've got a late-season dumping of snow. Which is just what the conditions were Friday when he lobbed a snowball at the star of his wartime drama, The Monuments Men, Matt Damon.

Damon responded the only way he could: by whipping a snowball back at the director! Costar Cate Blanchett stayed out of the fray, and according to local tabloid B.Z., the production team cheered them on.

Clooney and Damon then got back to work filming a scene outside of Berlin. The film is based on the true story of an allied division of men and women trying to rescue the great works of art that Nazi troops were pillaging from the countries they conquered.

While Clooney and Damon continue their on-set antics, Clooney's girlfriend Stacy Keibler spends her time shopping and touring. She was especially fascinated by the sausage vendor who carries his grill on his belly.