A classic. But consider;

A priest is giving a sermon. A man comes up to him after and says, "I need a lemon." The priest has a box of them in the back, so he gets this man his lemon. As he's handing the man the lemon, he asks "But why do you need it?" The man takes off. The priest chases him out, but the priest is in his 60s and the man gets away.

The priest doesn't have a lot going on, so he trains in running and next week the man asks for a lemon again. This time, the priest holds the lemon back and tells the man he won't hand it over until he's told why the man needs it. The man lunges forwards, surprising the priest and securing the lemon. He turns and runs out the door, but this time the priest his hot on his heels. The man runs for a few blocks and then jumps into a river and swims across.

The priest doesn't know how to swim.

Cue another week of the priest training, the man comes back for the lemon, the priest chases him out. The man jumps into the river, the priest follows. The man comes upon a cliff.

The priest can't climb.

Another week of training. The man comes in, grabs the lemon, runs, swims, and climbs. He runs for a while more, and then he runs into a cave.

The priest doesn't have a flashlight.

The priest buys a flashlight, and now it's the Sunday before Easter. The priest has a feeling he'll catch the man today. The man comes in and takes the lemon. He runs out and the priest gives chase. The man jumps in the river, and the priest follows him in. The man climbs the cliff, and the priest is hot on his heels. The man runs into the cave, and the priest draws his flashlight. He follows the man into the cave. It's dark as the pit Satan fell to, and yet the priest continues. He corners the man in a chamber, in which he can see 6 lemons, neatly piled on an otherwise empty table. The priest speaks; "I've trained for months just to chase you, please just do me one thing. Tell me why you need the lemons." The man agrees on one condition: the priest cannot, under any circumstances, tell anyone else.

And the priest was a good man and kept his word.