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 lawyer and an engineer
A lawyer and an engineer were fishing in the Caribbean. The lawyer said ''I'm here 'cause my house burned down and everything I owned was destroyed by the fire. The insurance company paid for everything.''

''That's quite a coincidence,'' said the engineer, ''I'm here 'cause my house and all my belongings were destroyed by a flood, and my insurance company also paid for everything.''

The lawyer pondered the engineer's plight for a moment and, looking somewhat confused, asked, ''How do you start a flood?''