“Nothing travels faster than the speed of light, with the possible exception of bad news, which obeys its own special laws.”
Variant: Nothing travels faster than the speed of light with the possible exception of bad news, which obeys its own special laws.
Source: Mostly Harmless
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Douglas Adams 317
English writer and humorist 1952–2001Related quotes

“Inflation itself proceeds at a speed faster than the measured speed of light.”
Source: Reinventing Gravity (2008), Chapter 6, Inflation And Variable Speed Of Light (VSL), p. 102

"Science Fiction, 1938" Nebula Winners 14 (1980) edited by Frederick J. Pohl, p. 97
General sources
Source: Before Galileo, The Birth of Modern Science in Medieval Europe (2012), p. 189

“Light travels faster than sound. Isn't that why people appear bright before you hear them speak?”
Source: The Rainbow: From Myth to Mathematics (1959), p. 204