One way I feed that curiosity is that I'm almost always paying attention to things people say to me and stuff that happens around me, when others might 'zone out'. The upshot of this is that if you tell me about something you like or care about, I'll actually remember it.
I make a subtle hobby of finding small ways I can make life better for people around me. Trash on the ground near a can? Pick it up and toss it. Cut or scrape? I've got a bandage in my backpack.
I've got a pretty dry, absurd sense of humor. I usually respond to sarcasm by playing it straight, to see where people will go with it.