The Scariest Story!

One night three guys walked home from the movies, and they decided to have a sleepover.
During the sleepover they decided to tell ghost stories. One of the guys told a story about a man from a mental institution who escaped. He ran throughout the school beside the institution and killed a lot of people. The second boy told a story about a guy who ripped bones out of living people and put the bones in himself. The third told about a guy who was supposed to drive a stake into a grave, but it went through his sleeve instead. When he went to get up, he thought something grabbed him and he died.
After the third guy finished his story, the two other guys dared him to go to the graveyard and drive a stake into a grave. He left.
One hour passed, two hours passed, then three, and then four. The boys got tired and went to bed.
The following morning the boys went to the graveyard. They found the boy curled up with the stake through his sleeve. They tried to wake him up but there was no pulse. They later found out that he died of a heart attack because he thought that something had reached up and grabbed him.