It's a very positive weapon, the spear gun, and easy to use. All you do is aim it and squeeze.
6 seconds sound clip from the Creature from the Black Lagoon (1954) movie soundboard.
You can hear this line at 00:19:32.096 in the Blu-ray version of the movie.
Quote context
[...]
- You don't understand the species very well, Doctor.
- How much time do you think you'll need?
- From where I'm sitting, I'd say a lifetime.
- We may not even have a lifetime.
- You mean this thing really works?
- Oh, yes.
- It's a very positive weapon, the spear gun, and easy to use. All you do is aim it and squeeze.
- What are you going to shoot at?
- Does it make any difference?
- Ease her off. Little bit, not too much.
- Give me that boat hook. I think we can just make it on this side. It's tight over here.
- It's impossible. But I, Lucas, will do it.
[...]