Swimming Pool Ghost Picture

We received this pretty cool ghost picture of a man showing up in the water of a swimming pool. Here's the story:

"I took this picture over the summer of last year...well, actually my grandma did when I laid in this chair by the pool wrong, and fell (I couldn't get up - it was funny, but I was going to throw away the embarrassing moment until my little brother says, 'Look there's dad'). He pointed to the face in the pool (where I circled it), but my dad has been dead for eight years."