He was laughing when your father found him. He died laughing, in a straitjacket. Your father never explained.
7 seconds sound clip from the The Mummy (1932) movie soundboard.
You can hear this line at 00:13:26.520 in the Blu-ray version of the movie.
Quote context
[...]
- In the days when he used to come out here, there wasn't so much competition.
- When he did, he found things. And once, 10 years ago, he found too much.
- Queer story, that young Oxford chap he had with him going mad.
- You break your season's camp, Professor Pearson?
- Your colleagues have returned to London?
- Yes. Whemple and I stayed behind to clear up.
[...]