From a Pop-Tart (TM) box: "Warning: Pastry Filling May Be Hot When Heated."
From a newspaper article: "A congressionally funded study has determined that many smokers are ignoring the warning labels on cigarette packages."
On the package for Top Cog (TM) automotive fan belts, the first step of the instructions tells you not to change the belt while the engine is running.
The container for a liquid radiator sealant contains the following warning on the inside of the pull top lid: "Caution: DO NOT LICK LID."
An automotive window screen used to keep the dashboard from heating up contains the following warning: "DO NOT OPERATE VEHICLE WITH SCREEN IN PLACE!"