Aunt Maud's Letter

Crazy Aunt Maud received a letter one morning, and upon reading it burst into floods of tears.
"What's the matter?" asked her companion.
"Oh dear," sobbed Auntie, "It's my favorite nephew. He's got three feet."
"Three feet?" exclaimed her friend.
"Surely that's not possible?"
"Well," said Auntie, "his mother's just written to tell me he's grown another foot !"