Common sense not included

Battery-operated toys carry this wonderful message: 'Batteries not included'.
Well, yeah. Batteries are not included. A Super-Sized Vanilla McShake is also not included. Neither is Zorrata, Death-Defying Daughter of Destiny, or the complete works of Oscar Wilde.
Then again, there are lots of other things that also don't have batteries included, like sauerkraut, leather jackets, and Post-It notes, and yet they don't carry this message.
What they're really trying to say is, 'You need to buy batteries to get this to work.' But no, that would be too explicit and direct, wouldn't it? So let's resort to a stupid phrase.