Quote from : Captain America: The Winter Soldier Movie

Steve Rogers: [in an elevator] You know, they used to play music.
Nick Fury: Yeah. My grandfather operated one of these things for forty years. My granddad - worked in a nice building, he got good tips. He'd walk home every night, roll of ones stuffed in his lunch bag. He'd say "hi", people would say hi back. Time went on, neighborhood got rougher. He'd say "Hi", they'd say, "Keep on steppin'." Granddad got to grippin' that lunch bag a little tighter.
Steve Rogers: Did he ever get mugged?
Nick Fury: [laughs] Every week some punk would say, "What's in the bag?"
Steve Rogers: Well, what did he do?
Nick Fury: He'd show 'em. A bunch of crumpled ones... and loaded 0.22 Magnum. Granddad loved people. But he didn't trust them very much.