Potentially Germany, where I grew up we said “Two idiots - one thought”. We have quite a lot if regional variety in these things.

My personal experience is that I just translate one idiom from one language / culture to the other without realising and still expect ppl. to know what I mean.

An app like Shazam but that shows me : this is the song you played and these are the songs it reminds you of because the melody is from here and the vocals melody is from here etc. I am mad that every other song reminds me of another but I cannot check which one it is.

Sure it could but the same issue is present with one question. Some students will get the wording or find it easy others may not. Having a test in groups to limit cheating is very common and never led to any problems as far as my anecdotal evidence goes.