You probably don't need to. The other guy gets on the stand and when he starts to talk about what he thought, your attorney will dramatically jump up and shout "objection"! The judge will hammer down the gavel and say "sustained!" and everyone will rip off his clothes and do the conga out the courthouse doors.How do we argue against his claim that he thought the property line was in a different place ?
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Realistically, the discussion on statute of frauds, parol evidence and the claim of what his intent was will be hashed out in a hearing before trial.