Frankfurt–a philosopher at Princeton and the author of On Bullshit—allows that bullshit artists are often charming, or at their very least, colorful. They have to be. Achieving their ends involves engaging others long enough to persuade them that they know what they’re talking about, when in fact, that’s the opposite of the truth.
Speaking of opposites, Frankfurt maintains that bullshit is a different beast from an out-and-out lie. The liar makes a specific attempt to conceal the truth by swapping it out for a lie.