My list of small acts...
Being from Boston where the drivers are the worst, I try to reverse that trend when possible. I actually will let people merge into traffic, willingly and with a smile and wave. I know it must seem like the natural and obvious thing to do for most people, but around here it's not the norm in the least. And the beauty is that people in back of me follow my example.
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I am big on holding doors open for people, young and old. Must be my European upbringing, but for me it's the right thing to do. It especially feels good when I can help out a woman with a stroller, or some old person.
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A homeless guy downtown saw me smoking and asked me for a cigarette. I gave him the whole pack. Frankly, I don't care about the health aspects of my actions; I care that I gave him a source of pleasure in what otherwise appears to be a rather miserable life.
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While taking the train last month, this young lady gets on board with 2 little kids in tow. They were so small, that climbing up the steps was a challenge for them and by the time they were all up, the train pulled away. One of the kids went flying and I caught him. It was the cutest thing; he latched on to my arm like it was a security blanket. And of course, I gave the lady my seat.
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Here was a RAoK that backfired: My dad and I were standing in the lobby of his apartment building; he was looking through what mail had come in that day. It's a good sized lobby, built in such a way that sound travels easily. He noticed a kid dropped a stuffed toy from a stroller, and the mom was impervious to this as she started to wheel the carriage away. We were standing a good 30 feet away, so he calls out to her "Maam." Once, twice, three times he called out. Finally, she turned around and he pointed at the floor and said "your child dropped that". She stood there, glaring at him, and snapped back "a gentleman would have picked up." My dad was floored, in a state of disbelief.