Six Degrees of Separation
idea that all people are six or fewer social connections away from each other. everyone can be connected by a “friend of a friend” statement aka six handshakes rule
See also - Small World Experiment by Stanley Milgram
Six Degrees of Bacon
Six degrees of Bacon is a trivia game based on the idea that any two actors can be linked through their film roles in six steps or less, using Kevin Bacon as an example