(Background: we are learning how to count.)
Professor: So in Russian, just like English, we have a special expression for thirteen. Just like you call it the dirty dozen, we have a phrase that means, translated literally, the "devil's dozen."
Entire class looks blank, seemingly unaware of any such English expression.
Isabel, timidly: Do you mean... baker's dozen?
Professor: Ah yes, that is it!
Bakers, devils, totally the same thing.