a very brief linguistics lesson.
From a posting on Quora.com, a most intersting website, where almost any question can be answered.
The question: “What are some of the best comebacks to a teacher?”
Here’s an answer I like:
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.”- Alan Bell.
Here’s the other answer I like:
Teacher : ‘Sugar‘ is the only word in english dictionary where ‘s‘ is pronounced as ‘sh‘.
A voice popped up from somewhere in the class – “Are you sure?” – Akhil Gaur.
http://www.quora.com/What-are-some-of-the-best-comebacks-to-a-teacher
You’d be astounded at the variety of questions being asked and answered on http://www.quora.com/.
Wandering Spirit 