We went to a big car boot sale last weekend and sure enough the wife disappears so I go up to the prettiest woman around and start talking to her. Sure enough my wife turns up in seconds. Works every time.
Your wife disappears to watch you from a distance, if she's that good at getting away and spying, then you better hope she doesn't start doing that to you!
If my partner got lost I would remember the soft spot I had for her, at the local swamp. If I missed her I would recall when I last did archery practice.