Haha my wife gave me that look when she caught me taking one of the fancy fluffy bath towels to my fish room. I kept going and quickly closed the door.
The next day i got an alert for my checking account over $400 charge(we have separate accounts but she also has a card for my account as a backup). I asked her what that was for and she said since she was out getting bath towels anyway she picked up a few things for herself. Now I obey that look.....
I did the same thing only with her favorite beach towel. She stopped me though and handed me old beach towels.