The seven dwarfs went to see a librarian...

...and Happy asked the librarian: "Can you find out if there are any dwarf nuns in the US?"

Librarian was a bit confused, but she wanted to help and went off to read some books. When she returned, she said: "I couldn't find anything about American dwarf nuns, what is this about?"

Six of the seven dwafs were chuckling, but they asked: "How about the whole American continent?"

The librarian answered: "I tried to find out, but couldn't find anything, so I don't think so."

Six dwarfs started laughing a bit harder, and they asked for a final time: "How about the whole world? Maybe there are dwarf nuns in some corner of the world?"

Librarian was confused, but answered: "I couldn't find anything about dwarf nuns in my books. What is this about?"

Now six of the dwarfs were rolling on the floor laughing uncontrollably, and finally, after a good while of laughing, happy managed to say from his laughter: "Grumpy fucked a penguin!"