When an attention seeking emo/wemo tries to go so many days without cutting themself, then they fail. (They go back to day 0)

Whenever something bad happens, no matter how pointless, say 'Day 0' to mock the attention seekers, but also as a sign of respect to people who cut because of mental illnesses.

when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life

The first day in Polytopia, used to make your first plays