Funny how even something funny can have a serious side to debate.
While all the posted about grounds for suit, grounds for summary judgment, etc may be correct, this picture is still comical. If true, clearly a pissed neighbor at another neighbor's statements/opinions. More likely? A photoshop joke.
Can it result in a suit? Why not? We live in a suit happy country where 1/3 of the world's attorneys reside, last I checked. I have read that 70% guesstimate is a myth.
Can't see how suing this person for placing this sign on his personal property would prevail if given to jurors with some common sense (I know, asking a whole lot here.
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