Any Random seemingly unexplained connection(s) between two people who are disconnected, ties that person to the other in a mathematical world infinitely. They become forever connected in their disconnectedness.
You see someone intriguing on the subway & then you run into them at work, event, meeting, elevator. P.S.R
You meet someone & you have the same bike, or they had the bike you have now. P.S.R
You say something cryptic or vague & someone completely unrelated knows what you mean. P.S.R
Two people walk in opposite directions at the same time and then they make the same decision at the same time. Then they correct it, and then they correct it, and then they correct it. Basically, in a mathematical world these two people will stay looped for the end of time.