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 Short Time to Live
A man hasn't been fealing well, so he goes to his doctor for a complete checkup.

Afterward the doctor comes out with the results.

"I'm afraid I have some very bad news," the doctor says. "You're dying, and you don't have much time left."

"Oh, that's terrible!" says the man. "How long have I got?"

"Ten," the doctor says sadly.

"Ten?" the man asks. "Ten what? Months? Weeks? What?!"

"Nine..."