The reason I ask is because someone at my job is doing this. Literally, one day she was talking so much garbage about a female coworker and giving her a hard time. The next day, when she found out that the female had been considered for a promotion (not above or on the same level as hers), she was so nice to her. Not only was she actually talking to the female coworker and not being short with her as before, she was actually laughing with her and telling her personal stories.

It sickened me. I called her out on it right after the female coworker left. Actually, everyone in our office was wondering why they were talking. Someone even mocked the situation and called the coworker her best friend. The brown-noser then said something to the effect of, "Well, we have to work together, now." She went on to say that you shouldn't burn your bridges, because you never know when you'll need to cross them again.

I don't see it that way at all. I refuse to kiss ass, especially at work. Ass-kissers are ass-kissers because they think that being fake and kissing ass is the only way that they can get whatever it is that they're trying to get. Therefore, I find it absolutely useless for me to kiss ass. Even if I didn't have the smarts to get what I want, I still wouldn't kiss ass. I have my dignity.