" To determine the truth or falsity of a statement you not only need to a set of special experiences, but you need to know the truth of falsity of a host of other different statements as well. That is, verifying that the cat is on the mat is not a matter of experience alone, but of accepting all sorts of other different statements, all the way from "Light rays travel in straight lines" to "I am not having another one of those darn flashbacks."
"Themes in Contemporary Analytic Philosophy as Reflected in the Work of Monty Python "

― , Monty Python and Philosophy: Nudge Nudge, Think Think!