Just yesterday I had to perform a re-installation of FreeBSD even though
I'd ideally was not supposed to do that. Why though?
Here's why:

>>
After uninstalling LXDE on my computer, I went to install XFCE from the
package repositories, it apparently went fine until I realized late that
it didn't.

- I replaced startlxde with startxfce4 on my .xinitrc
- I've tried to run 'startx', but guess what, it took the whole system
  down

*boots up the computer again*

I still had pekwm around so I put it again on said file, and somehow
worked okay until, *boom!*, another crash.

*boots up the computer yet again*

I made sure to disable the kernel mode setting drivers on rc.conf, and
rebooted, as that was the first cause of crashing.

Then I tried to uninstall xfce, another crash, then the computer
rebooted by itself.

I went to a single user shell, mounted '/' as R/W, ran fsck on it,
hoping for it to actually do something, and it finished. 

Well, tried to uninstall the remaining packages and it lead to another
crash. Turns out the filesystem itself got corrupted really badly (at
least my home directory wasn't affected, nor the base system either)
that it'd crash after trying to well, do anything on /usr/local
basically. 

I lived on a temporary NomadBSD setup on my flash drive for a couple
days that I had set up shortly after I downloaded it. 

Then I've downloaded GhostBSD yesterday, just after I uploaded a whole
backup of my home directory to a remote host.
<<

Lesson learned I guess? Only time will tell....