I think that most were very suspicious or aware of the person swapping, but didn't want to cause social drama.
Also reminds me of this expirement:
Quote:
Field Independence versus Field Dependence
A number of experiments in the past thirty years have been designed to study what psychologists call "Field Dependence" and "Field Independence."
Imagine this scene: A person is seated in a darkened room. Ten feet in front of this person (the subject) stands another person holding a luminescent square frame surrounding a luminescent straight rod. The room is darkened; all the subject can see is the frame and the rod. Both the frame and the rod are mounted on an axle, so they may each be rotated in both directions.
The person holding the frame and rod rotates both at random for a while. The frame is stopped and the rod con-tinues moving for a while. The person holding the rod and frame then says to the subject, "Tell me when the rod is straight up and down, the same as the walls outside."
Some people will make the rod straight up and down by using the square as a frame of reference. These people are called "field dependent" because they depend on the context or field provided by the frame to judge when the rod is perpendicular.
Other people line the rod straight up and down with regard to their own bodies. These people are called "field independent" because they operate independent of the square as a frame of reference.
Another variation of this experiment has the subject strapped into a tilting chair inside a room that tilts. Motors tilt both the room and chair and stop at some point at random. The subject is instructed to give verbal instructions to the operator of the motor that moves the chair to make himself line up straight. Field dependent subjects will tolerate up to a 33 degree angle of tilt and will say they are aligned with the walls outside as long as they are tilted in the same direction as the room. Like those who depend on the frame to judge the angle of the rod, these field dependent people depend on the tilt of the room to adjust the tilt of the chair in which they sit, even though their own bodies are telling them they are not sitting upright.