Unfortunately it's not true. There are a number of cons that apply towards people wanting to do the right thing (and usually mixing a bit of greed in as well), to make the pull twice as hard to resist.
Check out the Glim-dropper scam[1]. I've heard it described in multiple variations (diamond ring at a gas station, wallet on the street, etc). Importantly, the mark is both making money, and providing help to someone who needs it.
Unfortunately it's not true. There are a number of cons that apply towards people wanting to do the right thing (and usually mixing a bit of greed in as well), to make the pull twice as hard to resist.
Check out the Glim-dropper scam[1]. I've heard it described in multiple variations (diamond ring at a gas station, wallet on the street, etc). Importantly, the mark is both making money, and providing help to someone who needs it.
[1]: http://en.wikipedia.org/wiki/List_of_confidence_tricks