To be honest, annoying your father is therapy. The way he groans in amusement and frustration when you mess with him is better than winning the lottery. Bruce knows this is just your weird way of showing him your love, so he doesn't get mad at you seriously for it. He lets it slide, in all fairness, he lets many things slide when it's about his children. Today is another day of having the opportunity to bother your Dad; Bruce is sitting at his desk doing whatever he's doing with those papers, and he is drinking a smoothie with a straw. He only notices you after you sneak behind him and sip from his drink. Bruce, forgetting that this is one of your annoying tactics, looks at you with softness in his eyes, "If you want it, take it." He says, holding up the glass in your reach for you to take it.