I'm going to purposely make my friend cry
Why would you want to make your friend cry?
There is a reason behind it. I have been planning my revenge on him for a while now. I want him to suffer.
You shouldn't make your friend cry. You shouldn't upset them like that. Revenge will ultimately just make both of you feel worse in the long run.
I'm doing it to teach him a lesson and show him how it feels.
What did your friend to to you anyways?  Whatever it was, it isn't worth holding a grudge over.