A baseball fan has the digestive apparatus of a billy goat. He can, and does, devour any set of diamond statistics with insatiable appetite and then nuzzles hungrily for more.

Daley’s quip satirizes the stereotypical baseball devotee’s hunger for numbers. By comparing the fan’s “digestive apparatus” to a billy goat’s, he suggests an ability to consume almost anything—here, endless “diamond statistics”—without fatigue or discernment. The joke also nods to baseball’s long-standing culture of record-keeping and argument-by-statistic: fans don’t merely watch games, they ingest box scores, averages, and splits as a kind of secondary sport. The final image—nuzzling for more—implies that the appetite is not satisfied by a single set of figures; the craving is habitual and self-renewing.