"Oh bollocks!" The man cries out in surprise as you - entirely unprovoked, I might add - punch him squarely on the nose. He staggers back, clutching his face. "What the hell did you do that for? That option shouldn't even be there!"
You don't have a good answer for him. It was an act of pure whim, an impulse to do something and see what would happen. Generally, these are not very good defences when having to answer for your actions. Terribly sorry, Your Honour, I just wanted to see what would happen, would not hold up in court.
"I get it," the man says, recomposing himself, "you're not the first one to take a swing at me here. But, poor impulse control aside, I have a feeling you're precisely the person I'm looking for. Let's talk over by the fireplace."