
LeBron James has an ownership stake in Fenway Sports Group. Fenway Sports Group is considering making a bid for the Boston Celtics. According to the transitive property, if Fenway Sports Group bought the Boston Celtics, that would make LeBron James the owner of the Boston Celtics.
It is considered cruel to point this out to Celtics fans because their team was eliminated from the postseason by LeBron James and either the Miami Heat or Cleveland Cavaliers four times in the last decade before James signed with their most bitter historical rival, the Los Angeles Lakers.