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."

Burglars just broke in
An elderly woman had just returned to her home from an evening of religious service when she was startled by an intruder. As she caught the man in the act of robbing her home of its valuables, she yelled, "Stop! Acts 2:38!" [Turn from your sin]

The burglar stopped dead in his tracks. Then the woman calmly called the police and explained what she had done.

As the officer cuffed the man to take him in, he asked the burglar,"Why did you just stand there? All the old lady did was yell a scripture at you."

"Scripture?" replied the burglar, "She said she had an axe and two 38s!"