no one can, especially not on the internet.
words can be lies, films can be edited, you can have a chemical imbalance in your brain that causes you to see things that aren't there.
who knows, you could wake up tomorrow from a coma with a family you never knew.
or could be in a mental asylum only imagining this, or we could be liek the game: the sims.
on;y created to be controlled and laughed at by our masters,
no one knows, and like the great willy wonka said "never never doubt, what nobody's sure about"
nothing is impossible.