The barcode thing is ABSOLUTELY not innocent. It does control us.
I don't know about you northerners, but in the US, the grocery stores have little plastic cards that they give you after you fill out form with your name and address. When purchasing, you give them your little grocery store card to scan and it saves you anywhere from 50 cents to numerous dollars. (I get real excited when the total goes from $42 to $31 when it is scanned! I won't let them scan it until the end so I can see the before and after totals right there in block green numbers on the register.)
Then, the machine next to the register spits out coupons for the clerk to give me. Sometimes the coupons are for items I just purchased, but sometimes it is for items I have purchased in the past.
The evil little barcodes GOT ME! Next trip I'm buying Hot Pockets again so I can see the total go down another 50 cents when I buy three boxes of chicken broccoli microwavable pastries!
Then, when I eat them, the evil will be inside me!