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."

3 Questions
A man walked into a lawyer's office and inquired about the lawyer's rates.
"$50.00 for three questions", replied the lawyer.

"Isn't that awfully steep?" asked the man.

"Yes," the lawyer replied, "and what was your third question?"