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 man goes to his bank manager and says...
A man goes to his bank manager and says "I'd like to start a small business how do I go about it?"The bank manager leans back and clasps his hands together on his gut and replies "Buy a big one and wait."