My daughter used to pout that I spent all my time playing with daddy and she wanted to know what we were doing in there.
So we decided to make a pillow fort and get out his model cars and play under there untill she came in. She nearly hit the roof. She says "I knew it, ya'll are in here playing without me." She was mad for weeks over that.
I know, mean, but heck why have kids if you cant have a little fun know and then at their exspense.