Anya and Zack have very similar temperaments. Recently I went in Anya's room and I could tell she was searching for something. Found out she'd lost something important (in a really quick time frame) and I sighed in exasperation "Anya! Seriously?!" and she put her hand on her hip, got a calm (stubborn) little look on her face and said "Mom. I will find it." and stood there and looked at me with that face until I retreated and shut the door.
Now if the roles had been reversed and Ian lost something I would find him in his room writhing on the ground, hands clenched over his face saying "Mooooom! I can't find it. I can't find it. I can't find it. I think you must have MOVED it because it was right there and now it's gooo-one" and I would fling myself around his room in a frenzy, flinging things around saying "I can't believe you LOST it Ian. That's important and you lost it! And you're room is a PIGSTY, it's no wonder you can't find ANYTHING...oh look here it is!" and then he'd leap up from his tormented position on the ground and he'd fling himself to me in a hug "Oh MOM you found it, you're the BEST!" and then we'd whoop and high five and go on with the day.
Thank goodness we have Anya & Zack because can you imagine(??!) if we were all like us? And thank goodness Anya & Zack have us because their lives would be bo-oring without us (or so we tell them).