"Secret coincidence" could imply:

1. An unexpected alignment of events or circumstances.
2. A hidden connection or pattern.

This concept might relate to:

1. Synchronicity
2. Hidden patterns
3. Unexpected correlations

Secret coincidences might involve:

1. Unforeseen connections between seemingly unrelated events
2. Patterns or correlations that aren't immediately apparent
3. Meaningful coincidences that spark curiosity