How much is one of these? It could be a good investment. For instance, when you ask your boss for a 50% raise of your salary (which let's assume that would be ~500 $), and he yells at you "WHEN PIGS WILL FLY!! ", you leave his office calmly, buy one of these (let's say it costs ~100$), put it near his office's window, and return with a innocent (thus a litle bit evil) smile, and again calmly tell him to look through the window, then say "Well now..."