Speechwriters and others talk about "authenticity" all the time, but for examples we're usually forced to find our examples from outside the absurdly artificial context of the corporate world.
Say what you will about this testimony from the Iraqi journalist who chucked his shoes at President Bush in December; the dude is telling his truth:
More than a million killed, the destruction and humiliation of mosques,
violations against Iraqi women, attacking Iraqis every day and every
hour …
A whole people are saddened because of his policy, and he was talking
with a smile on his face
and he was joking with the prime minister and
saying he was going to have dinner with him after the press conference.
Believe me, I didn't see anything around me except Bush … I was blind to anything else. I felt the blood of the
innocent people bleeding from beneath his feet and he was smiling in
that way. And then he was going to have a dinner, after he destroyed
one million martyrs, after he destroyed the country.
So I reacted to this feeling by throwing my shoes. I couldn't stop the reaction inside me . It was spontaneous.
And, for better or worse, it was authentic, too.