"Oh, we were a regular Tower of Babel"
Tower of Babel
Public DomainTower of Babel - Credit: Pieter Breugel the Elder

The Tower of Babel appears in the Book of Genesis.  It was a hubristic attempt by early mankind, united in a single language, to reach the heavens.  God saw this extraordinary ambition and decided to thwart it, scattering the people across the earth and giving them all different languages.