It describes a feeling of increased synchronicity with the universe that extends beyond mere coincidence. Examples include locating objects of desire in strange places and meeting long lost friends.
It is similar though distinctive to the UR-Effect as it is a sense of recognising an emerging pattern from seeming randomness, as oppose to the more complete sense of connectivity associated with the UR-Effect.
The Pre-UR-Effect was first noted on the Care2 network as members of the Prepare to Unlock Reality group recorded personal events as they waited for Unlock Reality bookcrossing manuscripts to reach them in the post.
Jane felt the full force of the Pre-UR-Effect as she bumped into a long lost school friend as she went to pick up a bookcrossing copy of Unlock Reality from the post office.