That's Interesting...

I have never heard someone say "That's interesting..." at work without meaning "That's wrong."  What's funny is that it's generally a phrase used by people who don't know specific technical underpinnings of what they're commenting on, but are spotting a bug and attempting to process it.  Yeah, I've only heard people from QA and Product Development say that.  To be specific, I've never heard anyone say "THAT's interesting.." not "That's IIIiinteresting..." which seem to be the two different ways to intonate that phrase, where the latter could be synonymized as "Iiiiinteresting..." or "Huh."