My lovebird.
Lately he's become obsessed with shredding paper. He does a very neat job of it, working his way down the edge, like eating corn on the cob, making perfectly straight long strips, as precise as a paper shredder. Okay as long as it's newspaper the floor of his cage, or even a free calendar hanging on the wall, but he also has his eye on one poster in my office. He had already done considerable damage by the time I realized what he was doing, and now I work to keep him from doing any more. And that's what amuses me -- he will fly over and perch right next to it and look back at me. I will say, "No, don't do it." And he'll look away from the poster, maybe even turn around, but as soon as he realizes (or thinks) I'm not looking he turns back to it. I'll say no, and he'll stop and look at me. Just like a toddler who's testing his limits. I'm pleasantly surprised that he understands my demand, and amused at the way he tries to outwait me (or maybe outwit me).
Until one of us gives up, and he either gets involved with something else, or I put him back in his cage. Inter-spetial fun and games.