Yes, I vaguely remember during college, saying to my roommate, something about how God sees everything you are doing, even when you think that nobody knows and nobody is watching. And why would I even need to state verbally such an obviously truce fact?
Because I may not see what is going on behind my back, and why those little brats who think they are so clever are always sneaking around and plotting mean things to do to me, yet God sees all of this anyway, so that even if I don't see it, God sees that. God knows.