Taking a shit at someone else's house without asking first. It is a betrayal of trust, as proper etiquette is asking the homeowner if you can take a shit at their house. It is sneaky and can cause distrust between the individuals for years to come.

It can also be shitting during a party in a restroom which will be frequently used by the other party attendees. Therefore, destroying the bathroom enjoyment of the many people who will be using that restroom after you.

Taking a shit in a bathroom located near a kitchen or living room. This type of shit may cause the stink to leak into the common space, and ruin the day of the individuals enjoying that area.

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