title: xkcd theorem lang: en > For each and every behaviour on the Web, there is an existing [xkcd comic](https://www.xkcd.com/). Discovering [Planet Nine](https://en.wikipedia.org/wiki/Planet_Nine). [Click](https://en.wikipedia.org/wiki/Nibiru_cataclysm#Planet_Nine). [Click](https://en.wikipedia.org/wiki/Extinction_event). [Click](https://en.wikipedia.org/wiki/Holocene_extinction). [Click](https://en.wikipedia.org/wiki/West_Nile_virus). [Click](https://en.wikipedia.org/wiki/Mosquito-borne_disease). [Click](https://en.wikipedia.org/wiki/Skeeter_syndrome). [Click](https://en.wikipedia.org/wiki/Epstein-Barr_virus-associated_lymphoproliferative_diseases#Severe_mosquito_bite_allergy). *[Biten](https://www.xkcd.com/214/).*