First, their eyes, eyes can tell a lot about a person. After that, their whole expression/way of acting. Is she just pretending to be nice? I think he’s arrogant, is he? I adore her; I hate him. Sometimes you just get a gut reaction and I have learned to pay close attention to them and follow my gut. The times when I thought I owed the person another chance, I have paid for it. My first impression always seems to be right. Not following my gut? That’s 100 percent my fault.