I wouldn't joke about it, Paul.
2 seconds sound clip from the The Wolf Man (1941) movie soundboard.
You can hear this line at 00:51:49.600 in the Blu-ray version of the movie.
Quote context
[...]
- We've got to do something before the town becomes completely hysterical.
- Yes, this muttering of werewolves.
- Come along, Larry. We're discussing this wolf that seems to be roaming the countryside.
- Yes, you saw him. What's he like? Is he a big fellow?
- I wouldn't joke about it, Paul.
- Doctor, do you believe in werewolves?
- It might be a case of mental suggestion plus mass hypnotism.
- You mean by that, that he could be influenced by the people about him?
- Yes.
[...]