I can't stand them.
You know plastic people: They walk around with this silly grin on their faces, glad-handing you like you're their long-lost rich uncle, their favorite person. The ones who'll say anything to your face to make you happy, as long as they can use you to their advantage.
Just be careful when you turn around to leave. That BLADE between the ribs smarts.
They're the used-car salesmen of the relationship world.