How do I make a happy sim angry?

I have a sim with a great reputation and very balanced personality (no crazy quirks or mood swings) but her acting job often asks her to become angry so she can portray fights but how do you get them to fight with their friends or neighbors cause they don't really get mad easily. It just makes the other sim angry but not her. She's kind of famous so I think other sims are too tongue-tied or awestruck to say anything mean back to her. They just fume and stomp off. That doesn't really accomplish the goal. It might affect her reputation eventually though. Also, isn't there a teapot that is supposed to give your sims all the different emotional states? I've tried that but none of the teas made my sim angry.