There is no greater fear than fear itself. I'd wager that getting burried alive is pretty high on the list though. The fear of being buried alive and trapped in a coffin is now the basis of the world's smallest escape room.
The live-action puzzle game was developed by Spanish company Horror Box in Barcelona. Called "Catalepsy", a player has 30 minutes to free themselves from inside the coffin! A player must solve puzzles by teamwork with their partner who's in a neighbouring casket, communicating with loudspeakers, as the players are monitored over CCTV cameras.
A player can customise aspects of the experience, like the type of casket or whether they want to be "cremated" by virtual flames and artificial smoke.
Good luck getting out.