I interned at Sun (R.I.P.) back in 2003 and their game tables were always full. I could challenge anyone, from fellow interns to managers to senior engineers, and get a game going.

No matter what our positions were in the company, on the game tables, we were equals. And shit talking was spat pretty heavily as well :-D

It was a great environment and I personally felt that it helped build the level of trust (for me) and bring everyone together.