If you press the button to subdue an NPC but DO NOT hold the button to complete the action then after exactly 30 seconds they will make a random comment. In this video I've left the first subdue in completely to give a sense of the timing, but what follows is just the comments. It will be random each time, but an NPC will only make one comment; you'll need to re-load and subdue them again to get them to say another comment. Unless I'm mistaken, it seems that each NPC has his own fixed subset of about twenty comments which they will eventually start repeating. So there may be a lot more hilarious comments out there to be discovered! Also, for some reason, female NPCs don't make any comments at all?!
Credit goes to Heisenberg at hitmanforum.com for sharing this discovery. I clearly have too much time on my hands as I then produced a montage of 40 of these random comments. I am sure that there are more to be heard. If you hear any interesting ones please share them in the comments.
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