133 Smile, Everybady! p.416

    "When you're smiling,the whole world smiles with you." These are the words taken from an old song. These
words must have given Tomoji Kondo a bright idea. He started smiling classes. Now, they're all over Japan.
People from all walks of life, aged 20 to 83, attend these classes.
    As you enter the class, you must shout out, "Konbanwa!"(Good evening!) as loudly and cheerfully as
possible. Then you're supposed to make direct eye contact and smile as you shake hands with your classmates.
No bowing is necessary. Laughing is not allowed, either. According to Kondo, smiling immediately makes you
fell better. Sound like a good idea? Why not give it a try?

go bananas = go nuts = go crazy
bristling = difficult
Smile is the best medicine for your health.
contagious 传染的
seasoned traveller 老道的游客
attend to your studies  注意
should        be supposed to 更委婉
give it a shot = give it a try