Derren Brown (a hypnotist / mentalist) explains this phenomenon very well: http://www.shortlist.com/entertainment/derren-browns-guide-to-overcoming-awkward-situ

Derren Brown (a hypnotist / mentalist) explains this phenomenon very well: http://www.shortlist.com/entertainment/derren-browns-guide-to-overcoming-awkward-situations http://www.shortlist.com/entertainment/derren-browns-guide-t...