TV detectives have unusually good luck with photographs. When they're talking to a witness in the witness's home or office, out of all the photos available the detective will pick one out — usually a perfectly unremarkable one showing some person with his arm around the witness's shoulder — and ask, "Who's this?", and the answer will be relevant to the mystery at hand. Often it's not even a question, the detective is just admiring the photo.
- "That's a beautiful woman."
"Oh yes, that's the victim's fiance."