you know you are an InFP when :

this is from my own experience as an INFP so I 'll just start

1. you look for your glasses while you are wearing them.
2. you watch a movie and keep thinking about it for days.
3. nothing is fun unless it's your idea.
4. you stare at space for along time until someone bring you back to reality.
5. you make plans just to feel joy from not following them.
6. you hate to finish anything you started.
7. you refuse to learn driving because you know you won't focus or remmember where you barked.
8. you give names to everything around you even your toes."I named mine primo"
9. if anyone criticized you it's like the end of the world
10. if anything went wrong , you think it's all your fault and you try to fix it.
11. you are too sensitive , you feel everything intensely .
12. people tell you , you are messy and you answer , it's my organized chaos .
13. you see someone on the subway for the first time and you start to guess thier work or from where they were coming, you even try to see how the two of you might be connected.

actually this is all what I can think about it right now, maybe that's enough...