I too am a sucker when I see distress (especially in children).
The other week when I went snowboarding a little girl infront of me had a tray with a burger some snacks and a drink. The prices are exorbitant at places like this. When all she had was a $5 bill to pay for $5 worth of food that cost $11 she started having to remove a single item at a time and getting a new total. This struck me and I motioned for the cashier to accept the five dollars and let me pay for the rest.
When I worked at a gas station a father came in with his 2 children and along with whatever he was buying (milk and smokes and a newspaper or something along those lines) his children were practically begging him to buy some candy and a cheap knick-nack and he broke down to their pleas and asked me for a total. The man pulled out all his change and obviously couldn't afford it. I hated the idea of a man not being able to provide these simple albeit unnecessary and wasteful pleasures to his children. With his money on the counter I told him that this was correct, handed him his bag and bid him a good night. After he left I pocketed his money and charged the sale on my visa.
I also stop for people stuck on the road. I've given people rides down the street for gas, lent them my cellphone to call for help, pushed more than a few vehicles to the curb, pushed more than a few vehicles to get them started (When someone tells you to put it in first and hold the clutch dont put it in first and expect them to be able to push it started with the clutch released and dont make them work harder to get it moving fast enough for second gear!).
I've been lucky enough that when i stop people usually have things under control or honestly just need a little help and aren't looking for a sucker to mug or take advantage of.
I do these things because I would want someone to help me if I needed it, and because even if I dont want to push your car in sub-frigid temperatures, the person I want to be wouldn't think twice.
He spends a lot of time in airports and hospitals, and has a lot of opportunity for small acts of kindness, and he generally acts on that impulse whenever possible.
I absolutely LOVE that about him.