In which I have sudden sympathy with John

Adventures with the self checkout machine:

Me: scanned an item and put it in bagging area.
Machine: "Unexpected item in the bagging area! Please remove item."
Me: removes item.
Machine: "Item has been removed from bagging area! Please return item."
Me: puts item back.
Machine: "Unexpected item in the bagging area! Please remove item."
Me: removes item.
Machine: "Item has been removed from bagging area! Please return item."
Repeat.

Out of order machines are SUCH fun when you're the one to discover that it's out of order.