Why did the father in the series Frasier say 'i use the can like the rest of the world' when he make his son to give up the study where the son does the profound thinking what does the can refer to?

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Why did the father in the series Frasier say 'i use the can like the rest of the world' when he make his son to give up the study where the son does the profound thinking what does the can refer to?