Death
In any society, human death is surrounded by ritual - a wake or funeral is normal.  In some places it was common to eat the dead in a form of ritual cannibalism.  But this is no longer common, in part because disease like kuru can be passed this way. Human dead bodies are taboo in most societies and must be handled in special ways - for a combination of religious and hygiene reasons.  A human dead body must always be reported in law, to be sure it is disposed of properly. In 2021 the leading cause of death in the United States was heart disease followed by cancer and then COVID-19.