Lemonade and a Lesson

I was teaching a violin lesson today, and my nine-year-old daughter barged in and asked, "Would you like some lemonade?"

She was speaking to my student. 

The student looked at me.  Then she looked at my daughter.  "Um, okay."

Two seconds later, my daughter arrived with a glass of ice cold lemonade.

After the lesson, the student drank the lemonade.

Then the next student came - a piano student.

"Would you like some lemonade?"  my daughter asked.

"Yeah!" the student exclaimed

She brought more lemonade.

So ladies and gentlemen, the special of the day is, buy a lesson, get a free lemonade.  Any takers out there?