Odd and illegal things to add to mac&cheese

Preview
1. A falsified tax return
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2. Cyanide
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3. Heroin
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4. Kinder Surprise egg
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"Kinder Surprise eggs are still illegal in the USA but remain popular on the black market." (Wikipedia)
5. An envelope containing death threats
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6. An unvaccinated dog from abroad
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7. Revenge porn
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8. A gun with the serial number scratched off
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9. Anti-North Korea propaganda leaflet (if you're in North Korea)
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10. The Variola virus
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