Well.. why? It's pretty much accepted that anything anyone says in public is going to elicit at most a "shame on you" from someone as they leave the area so as to avoid getting hit. They know that noone is likely to start on them, because everyone else is too well behaved :P
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"I found it eventually, at the bottom of a locker in a disused laboratory, with a sign on the door saying "Beware of the Leopard". Ever thought of going into Advertising?"
- Arthur Dent
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