Odd and illegal things to add to mac&cheese

Preview

1. A falsified tax return

2. Cyanide

3. Heroin

4. Kinder Surprise egg

"Kinder Surprise eggs are still illegal in the USA but remain popular on the black market." (Wikipedia)

5. An envelope containing death threats

6. An unvaccinated dog from abroad

7. Revenge porn

8. A gun with the serial number scratched off

9. Anti-North Korea propaganda leaflet (if you're in North Korea)

10. The Variola virus