1 Ishmael: How did you get into my room, anyway?
2 Man in Black: You know how the government wants to introduce a back door to all encrypted communication on devices and the Internet?
3 Man in Black: Back in the 50s we succeeded on all physical infrastructure.
4 Ishmael: There's a literal back door to my room?!
4 Man in Black: You never cleaned inside the bathroom cupboard, did you?

Interestingly, Wikipedia has an article about the encryption type of back door, but none about physical back doors.

What are they hiding??