in my case, I was somewhere around 13-14, and my dad baited me into installing a Debian without GUI.
At that time I had barely used Linux before, so I didn't know what editor one would use in commandline if midnight commander wasn't installed. Asked my dad and he vaguely remembered there was `ed` which was a PITA, and then there was `vi`.
So I opened vi.
And didn't know how to exit.
Dad didn't know either.
So I did a Alt+F2, killall vi