Where Wakes, Dead Ringers, Graveyard Shift and Saved by the Bell come from.

Dead Ringer, you say?
*Spying intensifies*

Except for the fact that the term "dead ringer" originally meant a lookalike horse that was used to fool bookies during races. The dead part is meant in the same way as dead shot, dead heat, etc.

Well that's rather morbid.

I was about to ask if this is true. But your profile name answered my question.

I don't remember graveyard shift like that...

My teacher told us about that at the beginning of the year, and my friends have gotten extremely annoyed with me now that I say "Saved by the bell" a lot.

No bells were ever rung.

This seems likely to be mostly apocryphal.

We'd be screwed if a zombie apocalypse happened during the night watch