She was always smiling , always happy , for no apparent reason . laughing even when no one was making jokes , just loving life so much . I envied her .

Question: Why would someone laugh when nothing was funny ?
Answer: People might laugh a lot if they have a rich inner life and are pleased by little things in life .People laugh if they are choking on something .People laugh to put other people " Off " and frighten them .None of the above choices .