United Airlines forgot to stock a London to San Francisco flight last week with a crucial amenity. No, not the Sky Mall catalog, but something almost as important: toilet paper. Instead, the airline offered passengers on the non-stop 10-hour flight cocktail napkins, reports ABC Local. The napkins, unfortunately, had a slogan reading "Fly by the tips of your fingers" printed on them, adds the Daily Mail. A contributor to the message board FlyerTalk posted a photo of the napkins in a flimsy box with "toilet paper" scrawled on the front.