I just went to 7-11. On the way in, I held the door for a guy who was approaching.
I filled my coffee and grabbed a Clif bar and got in line -- right behind the guy for whom I held the door open. When it came time for him to pay, he said to the cashier, "please ring this up, too." (pointing to my stuff) I tried to protest, but he insisted, so he paid for my snack.
He said, "you got the door for me," and I said, "well, I appreciate it...that is very nice of you."
I'm sharing this for two reasons:
1) I truly believe in the kindness of strangers. Sometimes I forget that and then someone does something like this and reminds me.
2) To draw attention to all those slackers who I've held doors for numerous times. Let's just say that usually I'm paying for my own coffee, ingrates.