The Rule of Three in Comedy
The Rule of Three is one of the most reliable structures in comedy. The idea is simple: present three items. The first two establish a pattern or set an expectation. The third breaks the pattern in a surprising way. Two items create a rhythm; the third disrupts it.
Why Three Works
Three is the minimum number needed to establish and then break a pattern. One item is a statement. Two items suggest a pattern. Three items can either confirm the pattern (in rhetoric) or shatter it (in comedy). Our brains are pattern-recognition machines, and the Rule of Three exploits that tendency. This is closely tied to the incongruity theory of humor — the third element is the incongruous surprise.
Examples in Action
I enjoy long walks on the beach, romantic candlelit dinners,
and competitive alligator wrestling.
There are three kinds of people in this world:
those who can count, and those who can't.
I brought three things to the desert island: water, a knife,
and 400 episodes of a podcast I keep meaning to start.
Using the Rule of Three
When writing with the Rule of Three, make the first two items normal and the third item surprising. The contrast is what generates the laugh. The bigger the gap between the expected and the actual, the bigger the laugh. This technique works in one-liners, stand-up sets, written humor, and speeches.
The Rule of Three is also used in the structure of long-form jokes, where three characters or three attempts at something are common setups ("An Englishman, an Irishman, and a Scotsman...").