This is one of the biggest hack in my life:

We had a database project in our 2nd year of university where we had to create some complex database and input a lot of random data like postcode, names, weathers, age etc etc.

While everyone was struggling to copy paste random datas in the sql file to generate the data, I used an API from a website using Java to generate all the data.

People came to me and took me as a very brilliant person who does his project on time. I never told that to anyone