Via Tin Man: Product warning labels for physicists. My favorite: Some Quantum Physics Theories Suggest That When the Consumer Is Not Directly Observing This Product, It May Cease to Exist or Will Exist Only in a Vague and Undetermined State.
I’m partial to
PUBLIC NOTICE AS REQUIRED BY LAW: Any Use of This Product, In Any Manner Whatsoever, Will Increase the Amount of Disorder in the Universe. Although No Liability is Implied Herein, the Consumer Is Warned That This Process Will Ultimately Lead to the Heat Death of the Universe.
although all are good.