You have to be Sandra Bullock for this to work

This was an easter egg in earlier versions of Hamachi 2. The About box had a little π symbol sitting in the bottom right corner, just like in that computer movie from the 90s.

Clicking on it started this interaction.

Very few people got past the second step, i.e. realizing they had to change their nickname to Sandra Bullock. But if they did, they were rewarded by the total number of those who solved the "puzzle". The counter was reset with every server upgrade, but I don't think it ever got to the second digit.