It's in some people's nature to try to manipulate others at every turn. These opportunists care little about the consequences of their actions. They're conniving and deceitful, carrying out their schemes so stealthily as to never attract attention. In fact, on the surface, they can seem like some of the nicest individuals you'll ever meet, the last people you'd suspect of any wrongdoing. These people are masters at exploiting others' good nature. Their easiest and favorite targets are those who are perpetually nice and accommodating. They figure that people who lack a backbone are more likely to let themselves be taken advantage of. Once they see they can get a favor or two from them with very little effort, they press on with full force and never look back. The most common form of manipulation often involves what many deem the "root of all evil": money. We've all heard stories of women who use their feminine wiles to bilk wealthy men -- espe...