一個收入穩定、擁有漂亮貼心女友的心理醫生，忽然有一天變得不快樂了，生活什麼都不對勁了，於是他決定搭飛機出國找快樂，沿途在女友暗藏的筆記本禮物上寫下體會到的15種快樂的方法，陰錯陽差地他過了極樂夜生活，莫名其妙被綁架差點失去寶貴性命，重生後發現他最愛的就是出發前的生活。劇中有個巧妙且不時出現一下子的橋段就是筆，似乎提醒著現代人幾乎都不帶筆出門了。
以下是片中所尋找到的15種快樂的方法：
- 人比人，氣死人 Making comparisons can spoil your happiness.
- 許多人只在未來看到快樂A lot of people think happiness is being rich or important.
- 許多人認為快樂就是變更有錢或更有地位 Many people see happiness only in their future.
- 快樂是左擁右抱的幸福 Happiness could be the freedom to love more than one woman at the same time.
- 快樂有時得睜隻眼閉隻眼 Sometimes Happiness is not knowing the whole story.
- 逃避不快樂並不會更快樂 Avoiding unhappiness is not the road to happiness.
- 這個人讓開心或憂鬱 Does the person you are with bring predominately (A ) Up or (B) Down
- 快樂就是做該做的事 Happiness is answering your calling.
- 快樂是遇到真正欣賞你的人 Happiness is being loved for who you are.
- 快樂是生活中的小確幸 Sweet Potato Stew.
- 恐懼是快樂的阻礙 Fear is an impediment to happiness.
- 快樂就是覺得活著真好 Happiness is feeling completely alive.
- 快樂是懂得慶祝 Happiness is knowing how to celebrate.
- 傾聽就是愛 Listening is loving.
- 懷念的早已人事全非 Nostaigia is not what it used to be.
