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."

Bad Neighbours
A dog ran into a butcher shop and grabbed a roast off the counter. Fortunately, the butcher recognized the dog as belonging to a neighbor of his. The neighbor happened to be a lawyer.

Incensed at the theft, the butcher called up his neighbor and said, "Hey, if your dog stole a roast from my butcher shop, would you be liable for the cost of the meat?"

The lawyer replied, "Of course, how much was the roast?"

"$7.98." said the butcher.

A few days later the butcher received a check in the mail for $7.98.
Attached to it was an invoice that read: Legal Consultation Service: $150