Oh, Seymour. You'll never know what it is gonna do for me.

5 seconds sound clip from the The Little Shop of Horrors (1960) movie soundboard.

You can hear this line at 00:10:09.891 in the Blu-ray version of the movie.

Quote context

[...]

- What you got? A little surprise for me?

- Open it up and see.

- Alright.

- Dr. Slurpsaddle's famous tonic. Wait here.

- To be taken internally or externally for pain and neuritis neuralgia, headaches,

- If hit by a truck, call your physician.

- Alcoholic content: 98 percent!

- Oh, Seymour. You'll never know what it is gonna do for me.

- Oh, I can feel that surge of warm health going through me already.

- Look, ma. I gotta get my plant and hurry back to the shop.

- You mean that lousy weed out in the kitchen?

- Yeah. If Mr. Mushnick doesn't like it, he's gonna fire me.

[...]