I have tried to sneek stuff pass the wife but usually she does notice. It may not be that day but soon after I buy it. She'll say " did you get a new game" and I'll be like, "yeah I had that awhile.
My thing that I always get caught doing is getting a credit card seperate from ours together so I can buy gaming stuff. She always intercepts the bill after a while or so and when I get from work she has this look on her face of pure disgust!
I'm not proud of this and I'm really doing good lately. Thank god for Gamefly.