DON'T PANIC
"Don't Panic is a phrase written on the cover of the The Hitchhiker's Guide to the Galaxy. The novel explains that this was partly because the device "looked insanely complicated" to operate, and partly to keep intergalactic travelers from, well, panicking. It is said that despite its many glaring (and occasionally fatal) inaccuracies, the Hitchhiker's Guide to the Galaxy itself has outsold the Encyclopedia Galactica because it is slightly cheaper, and because it has the words "Don't Panic" in large, friendly letters on the cover." From Wikipedia
LD