I've noticed in NYC, most squirrels are black and not brown like most other places. Now of course they are black here in NYC because there aren't as many trees and a lot of black tops and gray colored roads..and it is protective from the natural enemy, the Red-Tailed Hawk in these parts...
However, i find it to be funny...everytime i see one, I go up to it and say, "Yo! Whazzup!"