Pigeon Egg Omelets Make People Puke

Explanation

This is a mnemonic to help you remember the timeline of the Cenozoic Era. Take the first letter of each word: Pigeon Egg Omelets Make People Puke → P-E-O-M-P-P, standing for Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene.