What is “bog butter”, you ask?  It’s like cheese, but not quite.

Some was recently unearthed in Ireland which was old – quite old.  Think expiration 15 A.D.  From the article:

Bog butter was often buried to preserve it to be dug up at a later date. Other research has shed light on it being buried as an offering to the gods or spirits in the hope of renewed prosperity. …

Such finds are common in Ireland and Scotland and the product, which appears as a waxy substance, was often placed inside a wooden casket or animal hide before being buried.

So the next time you find something far back in your refrigerator that you haven’t touched for the past three years, don’t worry.  It might be worth something some day.