"The rule of three is a writing principle that suggests that things that come in threes are inherently funnier, more satisfying, or more effective than other numbers of things. The reader or audience of this form of text is also more likely to consume information if it is written in groups of threes. From slogans ("Go, fight, win!") to films, many things are structured in threes. Examples include The Three Stooges, Three Little Pigs, Three Billy Goats Gruff, Goldilocks and the Three Bears.
A series of three often creates a progression in which the tension is created, built up, and finally released. Similarly, adjectives are often grouped in threes to emphasize an idea" from Wikipedia
The latin phrase "omne trium perfectum" (everything that comes in threes is perfect / every set of three is complete) sums it up perfectly.
Obviously getting a bit soft and missing Matthew too much. His rugby season in California is nearly over, he continues his travels in the USA later this week and will be home in about 39 sleeps!!