伊万（艾什顿·库奇 Ashton Kutcher 饰）曾经有一个糟糕的童年，因为他行为闯下了大祸，令他童年充满不堪回忆的往事。而事实上，他确实只是依稀记得一点可怕的情景，这些情景一直纠缠着他的正常生活。伊万接受心理学家建议，把琐碎生活记在记事本里，却偶然发现通过记事本回到过去。 
　　这时他才清楚记起，童年时候的自己做了那么多的错事。他幻想着用现在的意识，潜入童年的身体，去弥补种种过失给人们带来的伤害，尤其是希望与当年暗恋的凯西最终走回一起。然而他一次次的跨越时空的更改，只能越来越招致现实世界的不可救药。一切就像蝴蝶效应般，牵一发而动全身。

1.t has been said that something as small as the flutter of a butterfly’s wing can ultimately cause a typhoon halfway around the world. -Chaos Theory

据说，一些微如蝴蝶振翅的小事能引起很扫大半个地球的风暴——混沌理论

2.Whatever happened,it wasn't our fault.We were kids.There was nothing that we could do to deserve.

不管发生了什么事情，那都不是我们的过错，那时我们只是小孩子，我们无需为所做过的事情背负什么。

3.If anyone finds this it means that my plan didn't work and I'm already dead.But if I can somehow go back to the beginning of all of this,I might be able to save her.

如果任何人发现了这个就意味着我的计划失败了，而且我已经死了。如果我能以某种方式回到过去，回到当初，或许我就可以挽救她。

4.Would it make a difference if I told you that no one could possibly ever love anyone as much as I love you？

如果我告诉你"这个世界上，再也没有一个人可能像我那样爱你"，一切是不是可以变得不同？

5.She fucking killed herself tonight.She's dead.And so are you.

她今天晚上自杀了，她死了，你也要死。

6.There's no way on this planet I'd ever be in a fucking sorority!

在这个星球上，根本没有一种方法可以改变即成的事实的。

7.If the scar on my stomach didn't just come out of nowhere maybe my father wasn't as crazy as everyone thought.If I can make scars,do I have the power to heal them？What about Kayleigh's scars？

如果我肚子上的伤疤不是凭空出现的，也许我父亲并不像大家所认为的那般疯，如果我能制造伤疤，我就应该有能力治愈伤疤，那凯莉的伤痕又当如何呢?

8.I WILL COME BACK FOR YOU.

我会为了你而回来/我会为了你而回到过去。