Don't know about scratchcards but have 1 story to relate. Many years ago I was sat in one of my local drinking haunts when a young couple suddenly started to cheer and get very excited. Walkers Crisps were doing some kind of promotion and their bag was telling them they had won £100,000 from the bag they had bought from the pub.
Others including the landlord got involved and immediately rang the claims number. They were asked for the number from the crisps packet and after relaying it were asked whereabouts in London they were. The winners were actually in Nuneaton, Warwickshire which came as a total surprise to the competition organisers.
Distribution had obviously made a mistake and these particular winners (who received their prize) should never have even stood a chance. There were only about half a dozen of us there at the time and they didn't buy anyone a drink. As far as I'm aware they never came back either.
