Not weird at all. I used to take only the pillars but now if I'm in PJ/KL, I mostly take pics of the pillars and the cars next to mine. Just in case something happens to my car, I'll have their number plates. :-)
Reason why I started doing that is I saw some ppl trying to push the shopping cart in between their car and another car to get to the booth but of course only scratching the other car and not theirs. The other car, fender, both doors, side mirror and bumper paint peeled off....