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."

Any Last Words?
There was an Englishman, an Irishman, and a Scotsman, who were going to be shot.

On the day of the executions, they take the Scotsman outside.

"Any last words?", they asked.

He yelled "Earthquake!" and whilst the firing squad were running about in a panic, he climbed the wall and got away.

The Englishman, seeing this, thought he'd try it, so when his turn came.

He shouted "Flood!", and similarly escaped in the ensuing confusion.

The Irishman thought this was a good plan, too so when they asked him for his last words, he yelled "Fire!"