一个穷困难求生活着的单亲母亲阿林·麦克尼（Helen Hunt饰），为了养育儿子特雷夫·麦克尼（Haley Joel Osment饰）而拼尽全力，唯有通过沧海内戍才能忍受深深的悲伤与丧失。这两母子一直在无期之末的生活中存活下去。然而这一切都在某个天日发生了变化。特雷夫被教育了一个特别的社交学习任务：让世界变得更美好。深信善有善报的特雷夫，决心从自己开始，于是他请来了一个流浪汉来住在自己家中。这一行动激发了周围人们的良知和同情之心，渐渐地，他们也开始改变自己，创造出更美好的世界。
喜欢Haley Joel Osment!
#1 It has to be something that really helps people.
#2 Something they can't do by themselves.
#3 I do it for them, they do it for three other people. These are the rules when you pay it forward on October 20th.
最简单
让爱传出去影评