A high school math teacher asks his students if they know what the number 144 represents. Of course they don't know (there are numerous answers, but this is 2008).
He informs them that 144 represents a quantity called 'a gross'.
So then he asks, "What does the number 288 represent?"
They don't know that either, but he tells them it is two gross to mention.
The only person laughing is the 73 year old T.A. in the back of the class.