Grocery Store Etiquette

It's been a while since I've blogged about my pet peeves.  I went to Target Saturday.  So now I have quite a few more.  How many of these things bug you?

• People who stop their shopping cart right in the middle of the aisle while they study something on a shelf.  They are in another world and are totally oblivious to the fact that you need to pass by.  Even a polite "Excuse me" gets no response.  One of these days, I might be in the wrong mood and ram one of them with my cart.
• People who walk in groups (very slowly) down the aisle.  They can't follow one another in a straight line...they must all be side by side so that I, again, cannot pass by.  When I go grocery shopping, I am on a mission.  I like to speed walk, get what I need, and get out of there.  (By the way, old ladies are exempt from the slow walking rule.  When you're old, you have earned the right to walk slowly.  These aren't the people who irritate me.)
• People who leave their shopping cart messy.  Saturday, I found a half eaten, orange peanut butter cracker in my cart.   Baby Girl picked it up and showed me, saying "Ewwww!"  Sure, my kids make a mess in the cart, but I clean it up afterward.  Also, don't leave the deli paper in your cart from your sample of maple ham.  Don't leave your store ad or shopping list in there either.  Take all your trash with you when you leave.
• People who block off half the parking lot because they're waiting on a space.  If the person before you has just started loading their groceries into the trunk, you may not sit there and wait on them.  (If no one is behind you waiting, you are exempt from this rule.)  It is not proper parking lot etiquette to wait on another driver unless they are already in their car, getting ready to pull out.  (Another exemption- when it's Christmastime and there are no spots to be found anywhere in the lot, you may stalk another shopper and follow them to their car.  Sometimes ya gotta do what ya gotta do.)
• People who write checks.  Seriously.  It's 2012.  They have this little plastic card now called a debit card.  It does the exact same thing as a check, only it takes a half of second to swipe instead of the fifty-three seconds it takes you to fill out a check.  "Was that fifty-two cents or sixty-two cents, Mildred?"  Come on, join us in the 21st century and get a debit card already!

And yes, believe it or not, every one of these things happened to me during one solitary Saturday shopping trip!  I think I should write a book on Grocery Store Etiquette.  Anyone have anything else I should include in the book?