Because I didn’t know origin of that term and others may also find interesting:

The phrase **"tomfoolery"** originates from the term "Tom Fool," which was used in medieval England to describe a foolish or silly person. "Tom" was a common generic name used to refer to an ordinary or everyman figure, similar to how "John Doe" is used today. Over time, "Tom Fool" became a stock character in plays and folklore, representing someone who acted recklessly or foolishly.

By the 17th century, "Tomfoolery" evolved from this character, and it started to refer to foolish behavior or silly antics more generally. The word continues to be used to describe light-hearted or nonsensical behavior.