A popular children's science magazine in my country was running a game of associations in its monthly issues. In short, there were five columns, with five words in each column, one or two to be revealed each month. Readers had to deduce the word on top of each column, then deduce the final association word using those five words. You were supposed to guess only the word on top of the current column and send it in, but you could also take a shot at the final word. There was a prize for each correctly guessed word of the column.
So before the first round/column of the game was over, I won it, effectively ruining the game for the publishers, who thought it would run for at least six months. First I figured out the word for the first column, it was "circles". I then wrote a suggestion for the final word because why not, and my father helped me – it was "Archimedes". In the next issue of the magazine the editor stated that I had won the game, with all the prizes for individual columns (because not one of them had been won yet). They were: a yearly subscription to the magazine, binoculars, an amateur microscope, an amateur telescope, a computer (but a poorly built one) and some books. I had a blast with all of those, except with the computer, because it was a poorly built one and it disappointed me (a weak processor and RAM shared with the graphics card, making the system useless for gaming).