Person who can call them like they see them
Person can call you out on your well deserved justice or comupance
She screams, "OW!" Then chases after him as he runs away.
He slips on a bannana peel as he tries to make a get away and falls flat on his butt getting the breath knocked out of him.
Then his sister comes up and smirks saying, "Karma."
Brother replies sarcastically, "What are you, the karma duke?"