In France something similar happened, one day a poor man came up to me and asked me 'Tu n'as pas cent balles?' or something to that effect, I thought it a bit curious that he'd ask for 100 euros but in fact he was asking for 100 'old' francs, which would translate into roughly 25 eurocents.
So, there I was, getting money from the ATM, thinking I had hit the jackpot :)