oh I agree wholeheartedly.* the phrase, "I could kiss you" comes
   to mind as an appropriate expression of the level of agreement,
   although there are likely more manly phrases I could use
   instead. I argued passionately with someone on a philosophy
   group about this very subject last night.* He saw "thank you" to
   insult as passive.* But as you well know, a well placed "Thank
   You" is one of the most powerful things one can say, in any
   context, when it is genuine (or apparently so) without sarcasm.
   [with wit, yes, but not sarcasm. Sarcasm steals its power]