May Contain Evil/Playing With

Basic Trope: An evil product has a warning on the label declaring it to be evil.

Straight: Killer Kola is a Psycho Serum which has a small print warning label on the can declaring that it may contain traces of evil.
Exaggerated: Killer Kola is a Psycho Serum that has a huge yellow and black warning label on the can declaring it might contain tiny amounts of evil.
- Alternatively, the label is ridiculously small.
Justified: The company that sells Killer Kola do not want to be sued by someone for not listing evil on the ingredients list.
Inverted: Goody Gummy Bears has a label declaring it contains massive levels of goodness.
Subverted: Killer Kola doesn't have a label declaring traces of evil.
Double Subverted:... Unless you view the can under a blacklight.
Averted: Killer Kola doesn't contain evil.
Lampshade: "Look, it even has a warning label!"
Played for Laughs: Almost by default.