that you unpack the thing, look at it and say "What the BLEEP was I thinking when I did _________."
Then you find the baggie of mystery pieces and the inevitable thought of "What in the world is this piece of fabric for and why is it cut in this peculiar way?" is soon to follow.
Finally you realize WHY this is a UFO. You pour yourself a glass of wine and grab the instructions and a seam ripper.