"Pickled punk" is a carny term for a preserved human fetus, usually deformed, displayed as a specimen in a jar. These were once common in circus sideshows. Nowadays, the best place to find pickled punks is in a research or university laboratory or a medical museum, such as the Mutter Museum in Philadelphia. The world's largest collection of pickled punks, once owned by Peter the Great, is on display at the Kuntskammer Museum in St. Petersburg, Russia.