Detective : Bo, would you get me some water, please? It's hot like hell here in Summer.
Agent Bo : Here you are, sir! We got plenty of water....Oops, sorry, I spilt the water over your papers......
Detective : Don't worry, it is not "Water over the dam", those are drafts and I have them already saved in PC.
Agent Bo : Water over the dam?
Detective : Water over the dam means there is no revoking on the words once you have said, so think before you say. We'd better say something to build people up!