The ‘unusual’ thing JW’s will have to do that ‘won’t make sense’ in ‘the end’

The GB/elders always imply that JW’s will have to follow instruction ‘in the end’ and they will be asked to do something that doesn’t make logical sense from a ‘human standpoint’.

Where are they pulling this from scripturally?

And how do you think it’s going to play out, will they actually believe they are under attack as people at some point in history and conjure up some ‘unusual instruction’?