Boolprop It
Thanks to a wonderful post/guide by Monks on The Sims Resource Forums detailing how to use the Reaction Tester for Storytellers, I was able to put together this little guide to help you know what to click on the Reaction Tester to get the reaction you want.
You really should read her helpful guide for taking great screenshots, and this movie-making guide has some great helpful notes on the reaction tester as well.
Finally, I'd like to thank Monks for the screenshots that made this possible!