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 young Jewish man excitedly tells his mother...
A young Jewish man excitedly tells his mother he's fallen in love and going to get married. He says, "Just for fun, Ma, I'm going to bring over three women and you try and guess which one I'm going to marry."The mother agrees. The next day, he brings three beautiful women into the house and sits them down on the couch and they chat for a while. He then says,"Okay, Ma. Guess which one I'm going to marry."She immediately replies, "The red-head in the middle.""That's amazing, Ma. You're right. How did you know?""I don't like her."