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."

Be Quiet in Church
A Sunday school teacher asked her little children, as they
were on the way to church service, "And why is it necessary
to be quiet in church?"

One bright little girl replied, "Because people are
sleeping!"