i never ever grab any item in the front...whether it be the pop in the cooler, the can, the shirt, whatever... and if there is only one thing left on the shelf, aisle, rack, etc... i will often have a mini panic attack in my head and then walk away emptyhanded.
also, i don't let my foods touch on a plate - as a result, i often use multiple plates. the only exceptions is mexican food. potatoes and corn are also allowed to cohabitate.