Oh so many fun adventures, too much to count... But a few nice ones:
- HDD died, so ran a desktop system over network from a NAS (nfs) without HDD.. for months.
- Rebuilding a corrupted system (any bit advanced tools wouldn't start anymore, like apt).
- Custom bootable live cd based on Linux From Scratch (around 2002).
- Anything related to Kerberos and NFS4.
- Replacing syscalls to run software from a ramdrive that would otherwise not work.
- Recently using debootstrap to install Kubuntu with a ZFS root, which went surprisingly smooth and pretty easy.
I love Linux for all these insane possibilities.