Yes, and I could have won the lottery this week. You need more evidence than a mere "could have happened."
You seem a little bit confused.
When
onebigmonkey says "He made it up", it's not incumbent on me to prove him/her wrong; it's incumbent on him/her to prove that it's correct.
If I say that
onebigmonkey is wrong, and assert that this fellow didn't make up his story (perhaps this is too subtle for you, but you might notice that I did not make any such claim), then I'll provide evidence.