This may not be directly what you are looking for, but in my experience receptionists (for example) who are two-faced: They will be so oohey-gooey nice to you over the phone or when talking to you directly, but then are bad-mouthing you as soon as your back is turned!

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Though dreams can be deceiving, like faces are to hearts; they serve for sweet relieving when fantasy and reality lie too far apart.-Fiona Apple