An extrapolation of its present rate of growth reveals that in the not too distant future Physical Review will fill bookshelves at a speed exceeding that of light. This is not forbidden by general relativity since no information is being conveyed.

quoting a joke he heard from Rudolf Peierls. N. David Mermin (1990). Boojums all the way through: communicating science in a prosaic age. Cambridge University Press. p. 57. ISBN 0-521-38880-5.