Summary of Case Facts: Lucy, the plaintiff, had desired to purchase Zehmers (the defendant) farm for some time. Zehmer had, in the past, orally agreed to sell the farm to Lucy, only to later back out. One night, after the consumption of several alcoholic beverages between them, Zehmer agreed to sell Lucy his farm for $50,000. Zehmer wrote out his intention to sell his farm to Lucy on a restaurant bill with the amount of consideration listed, subject to Lucys satisfactory examination of the title. He then signed the restaurant bill and had his wife sign it as well. The next day, Lucy hired an attorney to inspect the title for the farm. Finding it to be satisfactory, he contact Zehmer to finalize the sale. Zehmer contended that the sale was merely a joke, and otherwise, his intoxication left him without capacity to enter into the contract. Lucy disagreed and sued for specific performance of the contract.

Question: What objective evidence was there to support the defendant's contention that they were just kidding when they agreed to sell the farm?