Pictures taken through the window of a bus or taxi or aeroplane, or when briefly stopped on our way somewhere, at a place not significant enough for me to devote a whole gallery to.
There could be a book written about taking photographs from a moving vehicle. Luck is a big factor. Wind the window down if you can but this is often impossible, especially if you are travelling by air in economy class. On the train, I found I could get the occasional picture by holding my point-and-shoot camera against the glass (dirty on the outside) and pressing the shutter button when something interesting flashed past, hoping to doctor the result later. With the pig picture, I was just lucky: the glass was clean and the motorcyclist went past quite slowly.