caught napping

The ability of certain students to put their faith in a machine translation, even when it flies in the face of all reason, never fails to amaze me.
This example is from a paper written by a lad who had been studying English at school for at least six years:

"We nap"

It made no sense in the context in which he'd written it, so I had to work backwards. "a nap" - a short sleep -  can be translated into French as "un somme"  (not to be confused with une somme: a sum of money, for example).

Nous sommes : we are, but the student obviously typed "nous somme" and that is precisely what the software translated : garbage in, garbage out.