Breaching Experiments on the New York City Subway
In an investigation of norms, psychologist
Stanley Milgram has graduate student researchers ask strangers on the
NY subway to give up their seat during rush hour for no apparent
reason. Surprisingly, the experiment produced anxiety and physical
illness in the researchers (including Milgram). Student researchers
reported that they are still traumatized by the experience thirty years
later.

Excuse Me. May I Have Your Seat?
Here is a NY Times article about this research, titled "Excuse Me. May I Have Your Seat?" http://www.nytimes.com/2004/09/14/nyregion/14subway.html?pagewanted=all&...
Did many of the strangers
Did many of the strangers stand up?
yes!
That is unusual how the
That is unusual how the experiment produced such affects? How could the correlation between illness and the experiment be proven? It would be pragmatic to assume a spurious relationship.
Cheers!
Actually I think the link is