God, just look at the bloodlust in their eyes.
How It Happens:
I haven't told this to many people, so it makes total sense to admit it in front of hundreds of thousands of strangers ... but I used to be a compulsive liar. Don't worry, I confronted and dealt with that issue several years ago, but from early childhood well into adulthood, I lied about absolutely everything. Stupid shit that didn't even require lying to protect myself or someone else -- lying without a purpose. Things like my shoe size or level of education. Claiming I could play certain instruments, in conversations where nobody even gave a fraction of a shit in the first place.
It wasn't until I started doing heavy research into dysfunctional families that I realized that this was a pretty common trait among people who have lived through abuse or neglect. It starts off the way you'd imagine: You learn by example from your parents or siblings. "No, I'm not drunk! We were just out of water, so I bathed in vodka. Get off my ass!" Then you start using it as a tool. "Yeah, I got all of my homework done. Can I go out and play now?"