One day Jimmy went down to the pond for a dip, but before he could dive in he spied his teacher, Mrs. Smith, emerging from nude bathing. When Mrs. Smith saw Jimmy, she grabbed the nearest object - which happened to be an old wooden box - and held it in front of her.
"Young man, I know what you're thinking," she said.
"And I know what you're thinking," replied Jimmy. "You're thinking that box has a bottom on it!"
