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Joe D.I agree barry. Very unlikely for any business person to be that rude... and completely unimaginable to believe you would be - even if I do call you during dinner.
The other part that made your hypothetical 'unbelievable', is that I already have the best Matty piece I ever saw. So if I ever see it in an auction, I would be the consignor not the bidder. 
"Joe- if I too may be a bit cynical for a moment: If I treated you a little rudely, perhaps insensitively, but in my next auction I had the best Matty piece you ever saw, what do you do? Deal or no deal?"
edited grammar. probably still incorrect.