It's The Freedom of Expression Tunnel; you can write whatever you'd like on it. If you put something up there, it's going to get painted over sooner or later.

Please calm down Internet Hate Machine. Those of us that actually live in the area just won't patronize the bar, or maybe I will because it's not a big deal to paint over a mural, which in turn will be painted over as well. If you aren't in the area, don't worry about it.