Toddlers are truly keen observers. You think they're just trying to smash a toy or eat their picture book, but they're constantly watching everything. In the recent months I had a whole lot of stories that follow the pattern of "how in hell did you know these items belong together?!". There are moments when I wonder if toddlers have a secret worldwide community, and communicate with each other while parents are asleep...
(Also our cat learned to use our daughter as a distraction sometimes, making her noisy so that we vacate the kitchen, while it runs in to snatch our dinner...)