Ever wonder exactly what it is that is in artificial sweeteners? Because in the Splenda ad for instance, they say "It's made from sugar, tastes like sugar, but is not sugar." What IS it then??!
Well I guess with humans it's not entirely different:
He SEEMS nice enough but has a giant, sexist ego.
She SHOULD be honest being a professor and all, but is a compulsive liar.
He LOOKS well put-together but is really chicken shit.
She LOOKS normal, but is really a *psycho.*