Assumption of the risk at the ballpark?

It is often stated that spectators at a baseball game assume the risk of getting hit by foul balls. (Technically speaking, this is not necessarily correct since the issue is those cases is not really a question of assumption of the risk, but that is another story). In any case, a case filed recently now asks whether a spectator also assumes the risk of getting hit by hot dogs thrown into the crowd. The lawsuit claims that a hot dog thrown by the Kansas City Royal's mascot struck the plaintiff and detached his retina. Go here for the full story in the Wall Street Journal Blog, here for the story in the Kansas City Star and here for a comment in the blog Lowering the Bar.