I love this one:
"The gentle reader will never, never know what a consummate ass he can become, until he goes abroad. I speak now, of course, in the supposition that the gentle reader has not been abroad, and therefore is not already a consummate ass. If the case be otherwise, I beg his pardon and extend to him the cordial hand of fellowship and call him brother. I shall always delight to meet an ass after my own heart when I shall have finished my travels."
Mark Twain (1835–1910), The Innocents Abroad (Ch. XXIII)
This paragraph is followed by examples, and although Innocents... was published 140 years ago, the observation is still quite valid.