In the early nineties I was going through a rough patch and staying rent free with a mate in Holborn,I had hardly any money and my diet consisted mainly of Safeway own brand crackers and cheap pate, occasionally cheese.
Then McDonald's did a no purchase necessary multiple choice scratch card...
I used to know somebody who would spend hours checking bags of opened envelopes for unfranked stamps, he used to cheer every time he found one, they usually came in batches but sometimes he could go through a whole bag and not find one which would leave him rather irate.
This was over 15 years...