These creatures you call mice are not as they appear. They are merely the protrusion into our dimension of vast hyper intelligent, pan-dimensional beings. This business with the cheese and squeaking is just a front. They've been experimenting on you.
— Slartibartfast (Richard Evelyn Vernon)
20 seconds sound clip from The Hitchhiker's Guide to the Galaxy (1981) - Episode 4 sitcom.
You can hear this line at 00:02:59.676 in the Blu-ray version of the TV Series.
