An old one..
Jesus goes for a walk in downtown Nazareth one Sunday afternoon. He comes across a large commotion in the town square and decides to investigate. As he gets closer he sees a young woman chained to a pillar who is being prepared for a stoning.

Furious at such a barbaric sight Jesus demands to know what is going on. A town elder steps forward and informs Jesus that the woman is a prostitute and that her crime is worthy of death by stoning. Jesus is getting really píssed off at this stage and jumps in front of the young woman to prevent the stoning from going ahead.
"Have I taught you nothing in my time here" he rants" let he who is without sin cast the first stone." With this a huge murmur goes through the crowd and they start to disperse dropping stones as they go.

Seeing this Jesus leaves the square with a warm contented glow happy in the knowledge that he has done some good. All of a sudden out of the corner of his eye he sees a huge rock coming from the centre of the crowd which strikes the young woman killing her instantly.
Jesus screams in anger and rushes to the spot where he saw the rock coming from with nothing but revenge in his mind. At the centre of the crowd he sees a frail old woman, with a smile on her face. Jesus looks at her and says "AH FOR FÚCKS SAKE MA !!!!!!!!!!!!!! "