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I thought it would be interesting to explore what this actually means, practically speaking.
Here is something to look at: http://www.accesstoinsight.org/ptf/dhamma/sacca/sacca4/samma-vaca/
From what I can gather the basic principle is that of not doing harm to oneself, or to others. This principle seems central to Buddhist ethics and the precepts.
Personally I don't see a problem with humour or "idle speech" ( chit-chat ) when it does no harm.
What do you think?