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."

A political man to a woman...
A political man to a woman, "You look beautiful today!!!!"The woman replied, "Thanks, but unfortunately I could not say the same about you.""Sure you could!!" said the political man, "if you could lie as well as I do!"