In one of the Hitchhiker's Guide books, Arthur ends up on a planet of people with Neolithic technology and is very excited to recreate civilization, until he re

In one of the Hitchhiker's Guide books, Arthur ends up on a planet of people with Neolithic technology and is very excited to recreate civilization, until he realizes that the only modern artifact he understands how to make from scratch is a sandwich. Luckily, everyone loves sandwiches.