Church Key
Many a barbecue and tailgate party was ruined in the pre-pop top days when it was discovered that no one had remembered to bring a church key to the proceedings. The pointy end punctured beer (and soda pop) cans open – one hole for pouring, one for a vent. The rounded end was used to remove bottle caps – twist-off crown caps weren’t invented until the 1960s, and even then it took some years for breweries to start using them on their products. But then again, most veteran party animals of that era knew how to open a beer bottle on a car bumper or table edge in an emergency.
via 11 “Modern Antiques” Today’s Kids Have Probably Never Seen – Mental Floss.