When I visited the Sherlock Holmes Museum at 221B Baker Street, I found myself wondering what would happen if I lost something there. It was an imagined problem, but the setting gave it a particular awkwardness.
In most places, a missing possession is just a nuisance. Here, I wondered whether I'd feel I ought to be better at noticing things. An address can set a surprisingly high standard for an ordinary visitor.

Comic transcript
Panel 1. Oliver holds a single glove in a museum hall. Sam gestures towards the right. A wall plaque reads "221B".
Oliver: "I've lost a glove."
Sam: "Shall I ask?"
Panel 2. Oliver raises his free hand to stop Sam.
Oliver: "Not here. Give me a minute."
Panel 3. Oliver crouches to examine the floor, still holding his remaining glove. Sam stands beside a counter with a box labelled "LOST PROPERTY" and holds up the matching glove.
Oliver: "I've narrowed it down to this room."