Within any 5 points in the plane that are in general position (i.e. points such that there are no 2 of them coinciding and no 3 of them on a straight line) one can always find 4 that are vertices of a convex quadrilateral.
The situation with the famous 6-people-party (see the Examples section here) is similar. They might say that the party is a symbol of disorder and the existence of a triple of mutual acquaintances (or a triple of mutual strangers) is a seed of order. It is not true! Everyone who has managed to organize 6 people to come to a party (especially when the sets of the planned and actual visitors/space/time coincide) knows that the party itself is a symbol of order. This is a useful attitude towards the world, that otherwise may seem chaotic. Think how much time and energy it needed to become what it is today!