Of course, it doesn't have to be a crown block. It can be a car backing over him, or he could fall out of the upstairs window.
6 seconds sound clip from the Double Indemnity movie soundboard.
You can hear this line at 00:21:13 in the DVD version of the movie.
Quote context
[...]
- Is there anything wrong with it?
- Then, if some dark, wet night, that crown block did fall on him
- Only sometimes it can't quite make it on its own, it has to have a little help.
- I don't know what you're talking about.
- Any little thing like that, just so it's a morgue job.
- Look, baby, you can't get away with it. You want to knock him off, don't you?
[...]