A ghostly memory

Recently I found back an old group pic of mine...with friends of course. And it was me who first discovered something wrong with the pic, on the morning of Ching Ming years ago..

Here's the picture:



Can you spot what's wrong with the picture...?

No?

Look closely.

Do you see the face?

*Note: There was no "statue, water, etc" behind us. It was a fountain, but there was no water spouting out then, I remember very very clearly.

That's only one of a few ghostly pics I've taken..

I did NOT photoshop this pic btw, this is authentic. I swear on my coconut-sized balls.
I got another pic..but that's until I find it back... till then, look out for that 3am toilet call from beyond..ehehehehe.