The Gematria for Vav is six. This is one of man's great downfalls. Man can begin with the truth and end with the truth. Man can begin with the truth and end with something less than the truth, a deception, a lie. This is what is represented in the word Shaw Vi .
Man is the conduit between the truth and a lie.
When the subject turns away from the truth that is the time to end the conversation. It is at that point that the Shaw Vi, the obvious falsehood, makes its appearance. It is for these reasons that the Shaw Vi is so incredibly serious. Last week in Parshas Yisro we briefly discussed the essence of a name. Holy reader, the same can be said for each word of Torah.