This reminds me once of using gparted on a disk. I got in and out of it a few times to make sure what I was going to do, then I launched it again (but I didn't

This reminds me once of using gparted on a disk. I got in and out of it a few times to make sure what I was going to do, then I launched it again (but I didn't add any arguments). Not only didn't it complain, it defaulted to my root disk, and I ended up destroying my partition table. Luckily the system was still running and I was able to backup everything before I shut the system down.