This. Everything else that gets a bunch of upvotes is to be done as a second or at least concurrent step. Whatever social media strategies you may take up later should all be based on and executed after the steps given in this answer play out. You may end up owning the bar after you are done with the lawsuit. — MadPhysicist 1 min ago

I think a lot of people have gone through this, as evidenced by the upvotes. No one has ever come out of it unscathed though. +1 for the idea of a picture of the actual offender. — Mazura 1 min ago

@Mazura: I upvoted the question, not because I've gone through this, but rather because it's so bizarre and novel that I've never even heard of this before. Agree with Barmar on the likelihood of backup here. — Daniel R. Collins 1 min ago