Bouncy, bouncy

One of the students was wlking down the street when she heard someone shouting her name. She looked around and could not see anyone around. Then it happenned again and she still could not see anyone. this went on for a few more shouts and she was getting more and more confused as everytime she looked around there was no one to be seen. Eventually she found out that a friend of hers had installed a trampoline in her garden. Well, it made me smile.