What do you want ???

My mother told me about her English teacher when she was in senior high school.
He was strict, but he likes to tell many jokes in the classroom.
He always said, "What do you want?"
"I want a cup of coffee."
So, if he teach in the classroom,
another student screaming from the key hole and said, "what do you want !!!"
That was joke for me and until now, if I remember my mother's story, I'm laughing.
hehehe....
what do you want ????
Bullshit....