I looked again, and found it was / A hippopotamus.

I just looked out of my window to see what I thought was an elderly gentleman in a dark business suit and overcoat consulting a pocket watch attached by a chain to his waistcoat. Except of course it wasn’t, because I am not Dickens. He was quite a young man, and it was an mp3 player attached by its headphones to his inside jacket pocket. But the attitude he struck as he stood there looking at it would have been entirely familiar to his great-grandfather.