I guess technically my answer is yes, although my situation is more of Me buying LEGO and when i get home taking it to my LEGO collection, and placing it where it belongs. Then not telling my wife.
It's not that important to her, if she would be home when I got home with LEGO she'd just say, "What did you get?"
So there is LEGO that my wife doesn't know about but she also doesn't really care.