I hate people that park across 2 spaces its just inconsiderate, and dont even get me started on people who park in disabled/child parking spaces. But I like everyone else like to look after my car. Just park as close to a wall or barrier as possible, leaving enough room on the drivers side to open the door. Let the passenger (if you have one) get out before you reverse in. If this is not an option, park under a visible cctv camera, then if damage occurs, catch the feckers! :tu: