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."

Actual Business Signs In USA
In the offices of a loan company: "Ask about our plans for owning your home."

In a classified ad: "Tired of cleaning yourself? Let me do it."

In a New York medical building: "Mental Health Prevention Center"

On a New York convalescent home: "For the sick and tired of the Episcopal Church."

Outside a country shop: "We buy junk and sell antiques."

In the window of an Oregon store: "Why go elsewhere and be cheated when you can come here?"

In a classified ad: "Vacation special: Have your home exterminated. Get rid of aunts."