When I greet her it will be with a slap to the face.
Why greet someone with a slap?
I think it will be a unique greeting.
Slapping someone in the face is not a nice greeting. The person will not want to speak to you if you did that.
Human relationships are dull and predictable. I want to make this greeting memorable.
You may think that it would be memorable, but it will be memorable in a bad way. She may never speak with you again after you slap her.