It is brightly printed on the carton of the Aluminum foil roll – BUY ONE, GET ONE FREE.
The little one sees it and comments “oh, this is so nice…we just have to buy one – then we will get the second one free..and in the second carton also it is printed the same, so we will get the third one free..and in the third carton also it is printed the same, so we will get four, and then five, six….wow!!”
I wish I captured that greedy glee in his eyes at that moment!! J