I've never been more serious in my life.

3 seconds sound clip from the The Return of the Living Dead (1985) movie soundboard.

You can hear this line at 00:05:20.256 in the Blu-ray version of the movie.

Quote context

[...]

- Oh, kid, I have seen weird things come, and I have seen weird things go. But the weirdest thing I ever saw just had to cap it all.

- Oh, yeah? What's that?

- Let me ask you a question, kid.

- Did you see that movie, Night of the Living Dead?

- Yeah, yeah, that's the one where the corpses start eating the people, right? Sure. What about it?

- Did you know that movie was based on a true case?

- Come on, you're shitting me, right?

- I've never been more serious in my life.

- That's not possible. I mean, they showed zombies taking over the world.

- They changed it all around.

- What really happened was back in 1969, in Pittsburgh, at the V.A. hospital, there was a chemical spill and all that stuff kinda leaked down into the morgue and it made all the dead bodies kinda jump around as though it was alive.

- What chemical?

- 2-4-5-Trioxin, it's called. It was to kinda spray on marijuana or something. And the Darrow Chemical Company was trying to develop it for the Army.

[...]