EDIT: I actually was a bit scared when, walking around Albuquerque in my first day in the US, I walked in front of a house with signs like 'TRESPASSERS WILL BE SHOT' or 'NO TRESPASSERS' or something like that (There had been a few recent news of shootings). I'm not saying it's logical, but it happened. It also felt uncomfortable when people looked at me weird, with suspicion maybe (I guess for walking through a residential area when I was clearly not from there?), but I don't know if it's related.