Everyone has at least one person in their lives who demands way too much and offers next to nothing in return. What remains a mystery when it comes to these unicorn individuals is where on earth their audacity lies. Seriously, if there is one thing we can learn from these folks, it's the shocking confidence to ask for (nay, demand) services they simply do not deserve. For instance, one of these folks had no shame posting on Facebook for a live-in nanny who would ostensibly cook, clean, take car…