I've stopped donating to charities, including those approached by my colleagues for their churches/temples/childrens' CCA/funfair tickets.
All those people who smile at me at MRT stations/shopping centres for survey/credit cards etc, all get a "not interested" wave bye bye.
Anybody who asks me for directions, I always look around if I'm surrounded by other strangers, with an "accidental" bump, & check my wallet/handphone.
I'm getting paranoid. Am I living in Singapore where the Great Men In White say is paradise?