Bubba left the bar late at night and wqs staggering home when he went into the graveyard to relieve himself. And in the dark he stepped into a freshly dug open grave ready for a funeral the next morning. Frantically he tried to climb out but he couldn't get enough leverage to pull himself up and nobody heard his cries for help.
Finally exhausted, he sat down in the corner of the grave to wait for morning.
Inexplicably Goober also coming home late from the bar wandered into the same graveyard and fell into the open grave. Also too inebriated to get leverage to pull himself out he still clawed at the walls of the grave and shouted and hollered.
Then in the total darkness Bubba said to him: "You can't get out."
But he did.