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He knew Samson, not Samson's brother or Bob. He also only knew that it was Samson's brother that was involved in it, not what his name was. He states that he didn't know him back then when they first met. He simply assumed that, when Marybeth talked about her uncle, she meant Samson's actual brother.
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"Fine. You want to eat? Let's see if you can eat PIZZA!!!"