The first documented bar joke was copied onto a clay tablet 4,000 years ago in the ancient language of Sumerian. Scholars have translated it, but the meaning remains lost. After the Twitter account @DepthsOfWiki posted the joke in March, thousands of people attempted to decipher it to no avail.

Yet, as cryptic as the bar joke may be, it offers clues into humor’s role in human civilizations and raises questions about when humor — and its sibling laughter — first emerged.

In this episode, the second of two parts, Endless Thread continues its journey attempting to deconstruct the beginnings of humor and explain an unexplainable joke from the forgotten tablets of the past.