A priest, a minister, and a witch go out fishing one day.
The Sun comes out and it starts to get hot, but it turns out that the sunscreen has been left back in the car.
“That's OK,” says the priest, “I'll go get it.”
He climbs out of the boat, walks across the water, and gets the sunscreen out of the car. Then he walks back across the water and gets back in the boat.
The minister doesn't say anything.
After a while, they start to get thirsty, but the water, too, has been left in the car.
“That's OK,” says the witch, “I'll go get it.”
She climbs out of the boat, walks across the water, and gets the jug of water out of the car. Then she walks back across the water and gets back in the boat.
The minister doesn't say anything.
Finally it's time for lunch, but the food, too, has been left in the car.
“That's OK,” says the minister, “I'll go get it.”
He climbs out of the boat, and immediately sinks like a stone to the bottom of the lake. The priest and the witch pull him back into the boat, and he sits there sputtering.
“How come you two can walk on the water, but I can't?” he whines.
The priest smiles at the witch.
“Should we tell him about the rocks?” he asks.
The witch looks puzzled.