“Facts are stupid things.”

“Fourth Doctor: You know, the very powerful and the very stupid have one thing in common: they don't alter their views to fit the facts; they alter the facts to fit their views.”

“You STUPID stupid girl. Honestly, you have done some stupid stupid things in your time, but this takes the biscuit of stupidity.”

“Since I am not as stupid as my children believe I am, I had immediately realized this might be a ruse, but I was not at all averse to a confrontation. In fact, I had been hoping for some such thing.”

“And sometimes you need too much to know the facts, and so humbly and stupidly you stay.”

“Nell," the Constable continued, indicating through his tone of voice that the lesson was concluding, "the difference between ignorant and educated people is that the latter know more facts. But that has nothing to do with whether they are stupid or intelligent. The difference between stupid and intelligent people—and this is true whether or not they are well-educated—is that intelligent people can handle subtlety. They are not baffled by ambiguous or even contradictory situations—in fact, they expect them and are apt to become suspicious when things seem overly straightforward.”