Be prepared to answer/create stories on the spot about experiences at work. Common questions in interviews are "Tell me about a time you [did something that shows how you react to various work situations]"
Tell me about a time you had a disagreement with a coworker
Tell me about a time where you made a mistake at work and what happened
Tell me about a time you had diarrhea in a very important meeting
Questions along those longs will probably pop up