Coins operate vending machines, mini-mart tire inflators and the increasingly rare payphone. But, when held in the fist, they dramatically improve the effectiveness of a punch, and can be placed in a sock or other sack to make a pretty good defensive weapon or tool to, for example, bust out a laminated window. Oh yeah, it'll also pay for lunch.
Very true Jeff, however, My vehicle has a small slot where coins go in the console, as well there is a change compartment in my wallet so normally in an urban setting I have places for quarters already and don't regard them as survival items.
Anything held in the fist can be a weapon be it a pop bottle or a can of soup you grab off of a store shelf. I am wearing socks on my feet at the moment, they are warm and snuggy but I do not include them or the change in my pocket as part of a survival kit. That was the only point I was making