Do you practice proper grocery store etiquette?

Do you practice proper grocery store etiquette?
I always return my carts to proper holding areas
I never block the aisles
I always push my car on the ride side of the aisle (in the USA)
I use self-checkout with fewer than 20 items and a cashier for more than 20 items
When I arrive at the store, I look for a cart that some jackass left in a parking lot to use, so the bag boys don't have to retrieve it
I tip the bag boys
All or most of the above
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Do you practice proper grocery store etiquette?
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