When you approach your car, walk around it.  Look carefully to see if it has been tampered with.  Me?  I look down at the tires to see if someone has punched a hole in one since a quick way to catch you is to ensure you have a flat tire.  Sneaky thieves will punch 2 tires so you *really* cannot get away.  And *really* sneaky people will not punch your tires–they’ll put 2 caltrops down right under the tire so everything looks fine until you start to drive away–then “Bang!” and you’re stuck.

So look at things first.