A click-bait ad on my newsfeed is captioned,
Die 27 peinlichsten Fotos, die man gesehen haben muss.
What, exactly, does this sentence mean, in English?
Is it equivalent to,
"The 27 most embarrassing photos you must [already] have seen." ? I suspected not.
I thought it more like,
The 27...that you ought to have seen.
If so, how, then, exactly does the perfective construction contribute? How would the following sentence differ in meaning?
Die 27 peinlichsten Fotos, die man [einfach] sehen muss.
[ My guess: the first sentence in question is simply German idiom; perhaps the second sentence means something more like:
The 27...that one must now - [is obligated, for any one of several possible reasons besides the intrinsic excellence of the photos] - see. ]