it is customary to put your blinker on, pull past a parallel parking spot, then back into said space. it might even be a law.
so, if you see someone obeying the law, it is not usually customary to pull in the same spot frontwards, get out, lock your car, making that grating "beek-emp" noise.
and since you did not even look at me, you did not see the lovely bird i was wanting to show you.
but, hey, merry christmas anyway - i'm glad i didn't decide to back over your little teeny car with my suv. i will not let you ruin my holiday spirit.