Rabbit hole

Rabbit hole may refer to:

• a rabbit burrow
• "down the rabbit hole", a metaphor for an entry into the unknown, the disorientating or the mentally deranging, from its use in Alice's Adventures in Wonderland
  • a slang expression for a psychedelic experience, from the same usage
• an initial page or clue that brings the player of an alternate reality game into its fictional world
• Rabbit Hole, a 2005 play by David Lindsay-Abaire
• Rabbit Hole (film), a 2010 drama film based on the 2005 play, starring Nicole Kidman and Aaron Eckhart
• Rabbit Hole Ensemble, a theatre company in New York City

https://en.wikipedia.org/wiki/Rabbit_hole