We all seem to know one . . . that certain person who invariably leaves us feeling drained, used, maybe even slightly abused. We may know quite a few of them, actually. They take whatever it is we have to give, then somehow always seem to want more. We come away from our encounters with them feeling like what transpired was way out of balance, and always in their favor. We’ve been had again . . . by a taker. 

Takers come in a...