- Is it possible that's what drove him out of his mind?
- Possible, yes. He was overexcited, he'd been working too hard.

— Joseph Whemple (Raymond Huntley), John Banning (Peter Cushing)

6 seconds sound clip from the The Mummy (1959) movie soundboard.

You can hear this line at 00:47:03.700 in the Blu-ray version of the movie.

Quote context

[...]

- The dictionary defines legend as being historical myth.

- But don't forget half the story we know is fact.

- We know that Ananka died on a pilgrimage and was buried somewhere in the jungle.

- We know that no survivors ever returned to Egypt.

- Now, if half the story is true, why not the other half?

- Because the other half is removed from fact. It's fantasy.

- Dad knew all about the legend. Perhaps having discovered that half of it was true, he let his imagination persuade him that the rest of it could have been.

- Is it possible that's what drove him out of his mind?

- Possible, yes. He was overexcited, he'd been working too hard.

- But remember, John, historical myth. Treat it as such. If you don't want the same thing to happen to you. A fairy story, nothing more.

- Help us, your servants, O Karnak, to fulfil the second of our tasks.

- Go now. Destroy the second of the infidels who dared to desecrate the tomb of your princess.

- Hey, Bill, give us a whisky. Make it a large one.

[...]