There was a man who used to drink lemonade everyday in a bar in the front of a catholic school. Some students bother him all the time by calling him lemonade. One day, that man went to the principal's office to complaint about that. The principal called all  parents for a meeting. After all, they took sanction against the kids. One week later, the kids saw the man drinking lemonade a the bar.    

One of them said : sugar

A second one said : water

And a third one said : lemon

After listening the man said : If you shake them I could go back to the principal for you .