1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30! Off you go! Come on, quickly!
31 seconds sound clip from the Dead of Night (1945) movie soundboard.
You can hear this line at 00:21:30.378 in the Blu-ray version of the movie.
Quote context
[...]
- Don't you know about sardines? It's a sort of hide-and-seek.
- Who's to hide? All right. Anywhere in the house, bar the kitchen. Cook's in a state.
- But I don't know my way about the house.
- I'll count 30. Turn your backs, everyone!
- Got you!
- It's all right. I'll go quietly.
- Shh! I'll stop here with you. When somebody else finds us, they pack in, too, like sardines.
- Hmm.
- No mortal cold, Sally. It's a cold from beyond the grave.
[...]

 Dead of Night (1945)
 Dead of Night (1945)  Phantom of the Opera (1943)
 Phantom of the Opera (1943)  Scooby-Doo, Where Are You! (1969)
 Scooby-Doo, Where Are You! (1969)  Halloween III: Season of the Witch (1982)
 Halloween III: Season of the Witch (1982)  Knight Rider (1982)
 Knight Rider (1982)