The science fair project that was re-used year after year

I remember in elementary school not having no clue on what to do for a science fair project while everyone else in my class had an idea. But it was that one day that an idea hit me while i was drinking a glass a water and then juice right after that, (I was really thirsty that day). The idea was very simple, to see which liquid beverage can freeze faster than the other so it was out of soda, water or milk. The science fair project was so simple that I ended up using the same project year after year just making a few minor changes, such as the teacher's name. Those were the good old days.