I'll tell you something else. This sounds like a joke, but it's true.
4 seconds sound clip from the Taxi Driver (1976) movie soundboard.
You can hear this line at 00:19:43 in the Blu-ray version of the movie.
Quote context
[...]
- Well, the guy at the newsstand can do it.
- Well, I don't work at a newsstand.
- Anyway, he's probably Italian.
- No.
- You're sure he's not Italian?
- If a thief screws up on the job, you know, they'll blow his fingers off.
- I'll tell you something else. This sounds like a joke, but it's true.
- If they kill a stool pigeon, they leave a canary on the body. Apparently it's symbolic.
- Why not a pigeon instead of a canary?
- I don't know why not a pigeon. Wait a minute. You gotta catch a pigeon.
- Great. I'll take you right over here.
[...]