What would you do if everything was fake?

your friends, family, job, all of your life. the house you live in, the whole state, nation, continent, world. what if i were to tell you you were in some sort of experiment, and we sorrounded you with all of this stuff just to see how you would live and react to everything? truman show style? if it all was just made up, all staged, since you were "born." how would you react?