rm -rf /usr on InstallThis ticket (which looks legit) is not famous. Someone published an installer (that runs as root) with the following line in it:
rm -rf /usr /lib/nvidia-current/xorg/xorg
Aw the pain and suffering adding just one extra space can have. The guy who made the error said, “Yeah it was really late and I was really tired.” Let it be a lesson to everyone. Don’t fucking code when you are tired! Get some sleep and come back at it.