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 preacher was completing a temperance sermon...
A preacher was completing a temperance sermon: with great expression he said, "If I had all the beer in the world, I'd take it and throw it into the river."With even greater emphasis he said, "And if I had all the wine in the world, I'd take it and throw it into the river."And then finally, he said, "And if I had all the whiskey in the world, I'd take it and throw it into the river." He sat down. The song leader then stood very cautiously and announced with a smile, "For our closing song, let us sing Hymn # 365:"Shall We Gather at the River."