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 wife for Adam
God says to Adam, "What would you like in a wife?"

"Hmmm," says Adam, "I'd like her to be the most beautiful creature in the world. I'd like her to do whatever I tell her to. I'd like he to work hard, be smart, enjoy being with me."

"Hmmmm", God says, "I can do it, but it'll cost you an arm and a leg."

"Oh," says Adam, "Well what can I get for a rib?"