Cardboard Sign

You always like to help out, right?
But it turns out that isn't always a good idea. A Good Samaritan stopped to help some guys whose truck had gone in the ditch just west of town. Once he'd pulled them out, they beat him with a tire wrench, grabbed his keys and ran off with his nicer, newer vehicle.
Anyway, the other day we were making our way from Yuma to Apache Junction, and had just stopped for lunch in Gila Bend. On our way back to the interstate, we saw a somewhat unkempt man by the side of the road holding a cardboard sign that said, "OUT OF GAS PLEASE HELP". A small jerry can rested at his feet.
So what do you do?
Lots of things run through a person's mind. I know mine was overacting, and since I tend to be cynical at the best of times, the scenario was not good. His appearance bothered me. Was he a busy, hardworking farmer who'd left his wallet at home? Or perhaps a labourer dressed in work clothing? Was he alone? Had he really run out of gas?
Somehow it just didn't add up, and a guest on Oprah once said, "If it doesn't add up, if you get a bad feeling, then GET AWAY!!" What bothered me was the sign. Anybody who runs out of gas usually doesn't have a piece of cardboard in the back seat and a jiffy marker on hand. Surely he didn't anticipate running out of gas, thus making the sign before leaving home?
You hear horror stories, and if you're like me you can make them up in your own mind without help.
If he was truly out of gas and in a genuine pickle, then I feel kind of bad. But I'm not wasting a lot of time worrying about it. Hopefully someone else came along and helped him out.
There was no room for him in our vehicle anyway. Our trunk is jammed, and the back seat is carrying the overflow. He would've had to sit in the front beside me and there's no way that was going to happen.
I briefly entertained the thought of throwing a $20 out the window, but the wind would've blown it away; besides he needed a ride, not money. Or so he was trying to lead us to believe.
So what would you have done??