Here’s another. If two people are parked like this and the spaces are tight:

_____________  
| F |   | F |   
| B |   | B | 

Then you should reverse into the space between them, like so:

_____________  
| F |  B| F |   
| B |  F| B | 

so your passenger door is close to the passenger door of the car next to you and there’s a bigger gap between your car’s driver’s door and the third car’s driver’s door.

Or like this if you drive on the wrong side of the road:

_____________  
| F |B  | F |   
| B |F  | B |