Do you want to dance, sir? In a dance party, a man was sitting on the chair. He was already there for a long time. He was not confident enough to actively invite a lady to dance with. He encouraged himeself again and again, but every time when a piece of music began he was still afraid to stand up. At the end of a piece of music, a young lady came to him and said,"Do you want to dance, sir?". He realized it was a chance for him to make a breakthrough. "Yes, of course", he stood up and replied. The lady said, "How nice", and then unexpectedly she added, "I've been dancing for several pieces of music and I'm a little tired, I need to take your seat to rest for a while.