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I also agree when you see a ghost or spirit you will know.
And what if this is also not true, necessarily? What if I see what you would call a "ghost", what you would say is the spirit of a discarnate entity... yet I would say its a thoughtform, or errant psi amnifestation, perhaps even an aetheric "echo". For you, the thing on the water may be the leaf, for me it may be a reflection of the clouds above.
That said, I've had a tiny handful of what I'd term "paranormal" experiences, some with a ouija board (which proves nothing except possibly minor psychic functioning on the part of the LIVING), I've gone numerous times to investigate the "Hornet spooklight" in Miami/Missouri, and while it was fun and interesting doing it and meeting different people, never saw jack. I was invited to an abandoned "haunted" hospital in central Oklahoma by a joint group of two regional ghost-investigation groups - didn't see jack.