A farmer was out on his Welsh hillside tending his flock one day, when he saw a man drinking with a cupped hand from the stream which ran down from one of his fields. Realising the danger, he shouted over to the man,
"Paid a yfed y dwr! Mae'n ych-y-fi!"
[Don't drink the water. It's disgusting!]
The man at the stream lifted his head and put a cupped hand to his ear, shrugged his shoulders at the farmer, and carried on drinking.
Realising the man at the stream couldn't hear him, the farmer moved closer, "Paid a yfed! Dwr ych-y-fi! Defaid yn cachu yn y dwr!" [Don't drink. Water's disgusting. Sheep poo in the water.]
Still the walker couldn't hear the farmer. Finally the farmer walked right up to the man at the stream and once again said, "Dwr yn ych-y-fi! Paid a'i yfed!" [Water's disgusting. Don't drink it!]
"I'm dreadfully sorry my good man, I can't understand a word you say dear boy! Can't you speak English?" said the man at the stream, in a splendid English accent.
"Oh I see," said the farmer, "I was just saying, if you use both hands you can get more in......!"