Scientists are usually pictured on screen as sober and humorless types, pre-occupied with numbers and empty facts. However, nothing could be further from the truth, at least among the scientists we know. We are deeply passionate about our fields, sometimes to the point of obsession. Yet we are also trained from the beginning to control this passion, not so that we can be seen as serious or important, but so that we don't fool ourselves. It is so easy to fall in love with an idea to the point that we can convince ourselves that it's true even when the data do not agree. And so we fight to keep ourselves in check – to not get too excited. We're like cars with the gas and brake pedal pushed to the floor; roaring, but also holding ourselves in place. Now and then, we get to take our foot off the brake...and it all comes loose.