Some pople lie to make themselves seem more interesting or important. They can set up all sorts of bizarre situations to make people feel sorry for them or want to be friends with them.
There was a program on TV a couple of weeks ago about a woman who said she was in the twin towers (high up) but survived, but her finace died in the twin towers.
Since then she has been interviewed by TV stations and newspapers and has become quite a celebrity.
She also became a guide at the ground zero site and took people round.
After some detective work by a TV program it turns out she was never IN the twin towers, and she never had a fiancee and did not know anyone who had died in the twin towers.
She obviously did all that to make herself seem more important than she really was.