@Shufei a friend in high school used to have a "game" wherein the goal was to collect shells in as many countries as possible.
What to do with the shells?
Create private hidden directories.
Potentially patch df and du to report disk space differently to root users? ;)
Set up (X)DCC bots.
Serve warez.
Good sort of friend to have for all sorts of reasons. ;)
@byterhymer Haha, that sounds like a fun contest game, really. But indeed even better to have the shell accounts in pocket for rainy days. Did your friend ever figure out the disk space hack?