Three feet
Dotty（薄弱的，精神不定的）Aunt Muriel received a letter one morning. While reading it, she burst onto tears.
"What's the matter?" asked her companion.
"Oh, dear, " sobbed Auntie, "it's my favourite nephew. He's got three feet."
"Three feet?" exclaimed her friend, "it's impossible."
"Well, "said Auntie, "his mother's just written to tell me he's grown another foot!"