You can feign emotions, expressions and you can put yourself in a certain state of mind through the practice of Acting. This ability to fool people can be used for good or for onerous purposes.
1. You are but an amateur and could probably skip school by feigning to be ill.
2. You have developed into a practiced actor.
3. You could bring yourself to act out almost anything.
4. You could easily make a living out of this.
5. Academy Awards and Hollywood, here I come.