只有在一个轻松幽默的环境下，人们才能笑口常开。笑有多种形式：有捧腹，有喷饭，有莞尔，有会心一笑，有嫣然一笑，有开怀大笑，有微微一笑，有咯咯笑、泯嘴笑、偷着笑、开口笑、放声笑、掩口而笑......不同的幽默会产生不同的笑，同一个幽默对不同的人也会产生不同的笑。
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