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 bus filled with politicians was driving through the...
A bus filled with politicians was driving through the countryside one day, on the campaign trail. The bus driver, caught up in the beautiful scenery, loses control and crashes into the ditch. A farmer living nearby hears the horrible crash and rushes out to discover the wreckage. Finding the politician she buries them. The next day, the police come to the farm to question the man. "So you buried all the politicians?" asked the police officer. "Were they all dead?" The farmer answered, "Some said they weren't, but you know how politicians lie."