Mothers....
A man calls his mother in Florida. "Mom, how are you?""Not too good,"says the mother. "I've been very weak."The son says, "Why are you so weak?"She says, "Because I haven't eaten in 38 days."The man says, "That's terrible. Why haven't you eaten in 38 days?The mother answers, "Because I didn't want my mouth to be filled with food if you should call."

A lecture about English
A linguistics professor was lecturing to his English class one day. "In English," he said, "A double negative forms a positive. In some languages, though, such as Russian, a double negative is still a negative. However, there is no language wherein a double positive can form a negative."

A voice from the back of the room piped up, "Yeah, right."