They call it the "Bunker Suite" because it's deep in the heart of the American Airlines Center. It's a rarely seen hideout for one of DFW's most famous billionaires. It's the exclusive home away from home for Mark Cuban. He works there on game day, hangs out with family, and hobnobs with some of the world's top entertainers. But, you can't get in without the secret code.
Maybe the artwork is from a disgruntled fan - or somebody who made some fatal choices in a gambling situation. My guess is some extra happy Hornets loving employee. Mavs can't catch a break anywhere.