"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe."
"The two most common elements in the universe are Hydrogen and stupidity."
"Just think of how stupid the average person is, and then realize half of them are even stupider!"
"Stupidity is evil waiting to happen."
— Clay Bond
"I'd all but given up my crusade to rid the world of fools... There are, I found, just too many!"
"Subway is a cosmic nexus of stupidity."
— A thread title at the Customers Suck forums.
Pray that there's intelligent life somewhere up in space, 'cause there's bugger all down here on Earth.
— "The Galaxy Song", Monty Python's The Meaning of Life
"The only reason laws like those banning smoking on campuses, requiring you to wear seatbelts, and texting while driving is because you guys have proven yourselves too stupid or irresponsible to do it without having to be told."
— A professor from New Hampshire at Colorado State University on the subject of such laws.
Alien 1: So this is he — The Reagan? A puny specimen, even for a human. Just like the defilers to worship such a one! Do you suppose ugliness is a virtue to them?
Alien 2: Or stupidity? Have you ever seen eyes so vacant?
"People ask me, 'Kent, do you think that there's intelligent life on other planets?' I reply, 'No, I don't even think there's intelligent life on this planet.'"
"Sometimes I think that the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us."
— Calvin, Calvin and Hobbes
"Because all you of Earth are idiots!"
— Eros, Plan 9 from Outer Space
"Common sense is a sense which is not common to people."
— YouTube comment
Council Woman: Are they intelligent?
Peakley: No, but very delicate... We are talking about extremely simple creatures here, Miss. Landing there would cause mass mayhem and planet-wide panic!
"Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so."
"You watched as their civilization was overwhelmed with violence, disease, famine, and Dire Chinchillas. Reflecting on these events led you to an epiphany: people are dumb."
— The Sims Medieval opening cinematic
"It is said: to err is human. Hehehe... stupid human."
— Pandarian, World of Warcraft: Mists Of Pandaria
"It was very simple. Only stupid Earth brains like yours would have been fooled."