Two guys were living in the same apartment building in identical flats. The first guy visits the second one and sees that he just painted his flat and it looks great. "This looks amazing" the first guy says and asks how many cans of paint he bought. The second guy says he bought seven. The next day the first guy drives to the store, buys seven cans of paint and starts painting his flat. After few hours he finishes the whole thing but he realises that he used only three cans of paint. He calls the second guy: "Hey man I've just finished painting the whole place, but I've used only 3 cans of paint and I have 4 left!" Second guy - "Yeah, me too."