This is a video that every heterosexual should watch, especially those that believe that homosexuality is not innate but simply a lifestyle choice.
This exercise is excellent because it doesn't simply ask the participants to put themselves in a gay person's shoes, which would be almost impossible for them to effectively do, but it actually asks the participants to imagine a world turned upside down. What if "being normal" meant being gay and straight people were a minority.
I'd like to know how many straight people who honestly go through the exercise still doubt our claims that we are being discriminated against for a trait we have no control over. How different would our lives be if everyone went through this exercise?