I saw a hand with ink at the sleeve's edge. It took me an entire staircase to choose what to ask.

• SanetoYou stood at the foot of the stairs so long, I thought your sandal strap had come undone.
  AritokiIt had.
  SanetoIt hadn't.
• HazukiWhose hand in the copying room isn't stained with ink. So whose hand was it, then?
  AritokiDon't ask.