Terry Pratchett's *Bloody Stupid Johnson* designed objects using the neater value of 3 for Pi
(as used in the book "Going Postal")
Bloody Stupid Johnson's Mail-sorting engine, the Post Office, Ankh-Morpork.
In the centre of this machine is one wheel that Johnson, for the sake of tidiness, designed with Pi of exactly 3, not 3.14-mumble-mumble-and-a-bit. In order for Pi to be exactly 3, the universe has been changed. The machine therefore taps through many layers of the space-time continuum. Mail came out of the sorting machine that wasn't put into it by the human hands of the postal workers. Mail from next week, mail from 50 years in the future, mail that could have been, mail from alternative universes, mail that people swore they posted but really hadn't, mountains of such mail.
Finally, Chief Postal Inspector Rumbelow beat up the machine so that it stopped whirring.