A drunk stumbles out of a bar and he makes his way into the cemetery behind the tavern. He walks right to the edge of a freshly dug grave, loses his balance and falls in.
There's a puddle of water in the hole, and he spends the rest of the night yelling, "Help me, I'm cold! Someone help me, I'm cold!"
At closing time, another drunk walks behind the bar and hears the noise. He gets to the open grave, looks down and says, "Of course you're cold, you idiot, you kicked all the dirt off yourself!"