I don't sneak anything in...as someone else said, I don't want to live that way. The exception is when I'm sneaking in a gift for him, but we've been married for almost 28 years and have resorted to buying our own gifts and telling each other about it. I do make him wrap mine, though!
My sweetie-pie has started rolling his eyes when I bring home fabric, though. I just say, 'Well, you wanted me to have a hobby!" And he walks away. He had no idea how much this hobby can cost, but he is finding out!