I'm not particularly gullible person, but I have a tendency to want to believe what people say to me. I speak honestly to others and expect the same in return.
I'm stumped when people lie. And when they lie about stupid things, I'm even more stumped.
Have you seen any of the Lie Witness News episodes that appear occasionally on Jimmy Kimmel Live? They're quite remarkable. He sends a camera crew out onto the street to ask people about an event that never happened, and they go on and on lying and lying.
Here's one clip of them discussing the Super Bowl a week before the event took place. Why, oh why are people compelled to make up elaborate stories to go along with the lie?