I was once told that Santa did not exist, The worst part was when my parents both dressed as him and mocked me. "Here is Santa" they said, " you moron!"
It was horrifying. I cried for at least ten minutes, then they said "the real Santa is evil, you will thank us later", which I did because it turns out the real Santa is evil, he is basically James Bond in a fat suit and he killed my Uncle and slept with my auntie. I now have a hatred of James Bond as well.