Giving cash to homeless people at the roadside. Best to give bills/coins while traffic is stopped, but more challenging if done on the move. Looks pretty smooth and cool to other drivers if done correctly; usually at slow speed and not holding up traffic. The recipient is demonstrably thankful.
After the light changed, the motorist in front if me was drive-by donating. Handed off a few bills to a homeless person on the median while going about 15 MPH.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.