Accidentally harass anyone. You have to be careful because it's easy to say things that are not necessarily intended to cause offense but could be perceived offensively by the other party.

Things like, "Wow! You look great today, Janice. That top really accents your tits."

Or, "Ryan, I think you would be a great fit for the managers job. If your interested, you should stop by my place tonight and fuck my brains out."

Now, as innocent as both of those scenarios might appear on the surface, they are both examples of different types of sexual harassment.