What is the worst way to break your system without deleting data

sudo dd if=/dev/urandom of=/dev/mem

chmod -R 000 /

I hear if you privately run a Tor exit node, the FBI will make a free offsite data transfer

Bricking your BIOS comes to mind.

Physical damage, spills, etc.

Copy few debian system files into your arch directory.

With a hammer.

Probably not the worst way but breaking the bootloader is definitely annoying.

Installing KDE on my EeePC 900 didn't work out too well

simple: sudo apt remove apt

apt 🔫 apt