Katzenjammer: Literally, "cat's wail" and hence "a discordant sound." A bad hangover or a general state of depression or bewilderment.
"I don't think I've ever felt so bad in my life," Tony admits to Emily one morning as he lifts her up from her cradle and carries her over to her changing table. "Oh, don't give me that look," he mock scolds her as she rolls her huge dark eyes at him. "You've been learning that from Mummy, haven't you?" Emily squeals in delight as he sets her down and tickles the bottoms of her toes.
"However, I must make a formal request of you," Tony tells her as he dresses her in a little paisley onesie with daisies embroidered on the front. Emily gurgles up at him, but her expression doesn't indicate compliance. Or understanding, for that matter, but that was an issue for another day. "You see, Daddy has a very important business meeting in a few days, and you have the unfortunate habit of making a ruckus in the middle of the night. It is quite a fearsome sound, and I'm sure Thor would be proud of you if he ever has the...pleasure of watching you for a few days."
Emily burbles up at him, waving tiny hands and tangling her fingers in his goatee.
"I would appreciate it if you could manage to keep the noise under control. Just for a few days. In exchange...I will feed you the sweet potato mash instead of the gross pea stuff Mum likes to give you. Does that sound good?"
Emily smiles gummily at him, and Tony sighs, massages his aching temples, and carries her down to the kitchen for breakfast.