Watch out for bikes and pedestrians please. Few people expect a car (especially on the other side of the street/lane) to drift by a space then reverse into it after passing it by.
EDIT: To be clear, I'm describing a perpendicular-parking scenario, where people usually make a right angle turn going forward to occupy the space.
Contrast this with drivers I've seen who will haul ass into a parking space at 15 MPH and then brake immediately.