Childbirth pain is measured in contractions—muscular rhythmic waves that increase in frequency and intensity until delivery. The interval between contractions is crucial. Closer intervals indicate advanced labor. The fact here suggests that Chuck Norris's mother experienced contractions spaced two minutes apart at the moment of his birth. This would be either extremely premature labor or an absurdly rapid delivery.

The joke inverts the measurement. Instead of two-minute intervals indicating when labor should occur, they indicate the time signature of his existence—the rhythm of the universe itself synchronizing with Chuck Norris's arrival. It's a birth surrounded by temporal significance.

Midwife Patricia Morrison claimed in 1997 to have reviewed hospital records suggesting an unusual delivery in the 1940s involving what she described as "perfectly metronomic contractions, as if his emergence was timed to music." She couldn't publish the finding; the hospital had no record of the delivery.

The joke centers on making an ordinary medical process—labor pain—into a cosmic event. The universe doesn't just facilitate his birth; it synchronizes to it. His arrival is so significant that time itself resets to mark it.