1. This line is being screamed by random homeless guy in subway:
Maybe he is on drugs? Maybe he is drunk? For christ sakes he is HOMELESS!!!
So, maybe that hobo ofcourse MAY be a ratman, but not a ratman everyone is talking about.. Maybe it is just a refference of "The Catman" which eats rats (i dont remember in which country, just check it out) and yells I AM CATMAN when somebody asks who he is!
2. Maybe its only the affect of the drug? Remember Max Payne and its drug Valkyr? People who had Valkyr talked random bullsh*t... As we know rockstar was a publisher... So...
Now, another theory about the speeches of "Damn there is some scary sh*t down there in the subway". This is the conversation you can hear of two hobos talking:
1. As we discussed before, hobos may be on drugs or drunk.... So maybe it is affect of these thing, maybe they are seeing sh*t... Lets get back to Max Payne again.. Remember : "It's coming... It's Coming... We all gonna die..." . Maybe its just another vision of their...
2. Maybe there is that "Ratman/Catman (watch "I AM RATMAN" theory number 1)" and they're scared of his crazy act... Or , the person who says the line acts strange, and another hobos who has some more brains thinks that he is crazy.
Rat squeezing noises:
1(and the only). This is a subway dude... Everything may be there, rats, cats, dogs and ETC.
Final Explanation:
We now can actually DENY the Ratman existence, because: 1. Lack of evidence;2. Everybody claims that had actually seen him but NOBODY took a screenshot of him...;3. All the videos which is investigating Ratman myth, shows nothing, just empty subways.
So yes.. Now we can rely on words: "Person is innocent until judge had proved that he is guilty"
So Ratman remains a myth, until somebody shows exact screenshot or video or any other evidence of Ratman!
The best way to spread some rumours about some creatures or etc. is just before the release, or like 2 days after release, very carefully checking all the areas and draw your creature based on them... So yes... Someone inspected , that Subway has some rats, is dark, scary, some random hobo saying sh*t, and had spreaded the rumours about Ratman...
Thanks for your attention.. This was Ratman theory by Rytuklis. Waiting for your feedback in comments, please have tolerance and accept other opinions, but if you actually disagree with it, post your own, without any bad words and ETC. Thank you

