On the commuter train:
"Hey can I help you? You keep staring at me."
"Oh sorry, my eyes are just wandering and getting stuck places."
Angrily: "Well it's really rude to stare, could you stop!"
Getting angry too: "Well it's not my fault you're reflecting photons in my direction! Could you perhaps stop doing that?!"
Petulant: "Fine!"
A *worp* sound as the person promptly disappears from view.
Mollified and surprised: "Oh... Uh, okay!" Goes back to looking out the window.