Well I'm glad I'm not the only one that has this problem! It seems most annoying when I hold the door open to make sure it will stay open and then literally out of no where it slams shut.
My mother even commented on it the other day when I had my door completely open and it stayed open for a good 30 seconds.. NO one was near the door, Not the SLIGHTEST bit of wind. NOTHING could have closed the door and slam, it shut.
Like all you guys have said it sucks most when you are most unexpectedly getting something out of the passenger seat while having your leg out the door to get out and WHAM right in the shin.