Whether or not every star is in a constellation depends on your definition, actually. By some, "constellation" is a region of sky. By others, it's the actual stars which make up the image in question.
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"