When my kids were little we lived in a house with a sunken tiled tub, with mirrors on the wall behind it. Our cat liked to sit on the ledge, which was quite wide.
One day I was bathing the kids, and after they got out of the tub, the water was slowly draining out, and the cat was mesmerized, staring at the receding water line, and leaning further and further over the edge until he fell in! Well, he knew he had made the biggest mistake of his life, and immediately jumped out, only he was disoriented and hit the mirror instead, which caused him to fall back into the water!! I was laughing hysterically! His dignity was ruined, but he never made that mistake again!!