˙ʇno ǝןdoǝd ʞɐǝɹɟ puɐ ɹǝsn ǝɥʇ oʇ ns oʇ ǝƃɹn ǝɥʇ ʇɥƃıɟ oʇ ɹǝpɹɐɥ sʇǝƃ ʇı ʎɐp ʎɹǝʌǝ puɐ

(http://xkcd.com/686/)