Fabienne [Pulp Fiction French Girl]: A pot. A pot belly. Pot bellies are sexy.
Butch [Bruce Willis]: Well you should be happy, 'cause you do [have a pot belly].
The net result of that conversation is NSFW in a positive way (here is the script http://www.geocities.com/Hollywood/7606/pulpscri.htm).
I've had a similar conversations, and it doesn't always go so well. In retrospect, I believe the reason is that Fabienne considered herself beautiful and knew Butch was merely trying to get a reaction from her. Previous ladyfajitas didn't all feel the same way about themselves.
Another example; I'm a bit homophobic, and I get teased for it occasionally. A friend of mine from years ago also behaved homophobically, but reacted badly to the same teasing. He came out of the closet last year.
His bad reaction was due not to the input, but his own internal state.