I went to open the valve on my Fermonster, only to have the whole thing come off in my hand. So there I am with a full carboy that now —because there is no valve — just has an opening at the bottom, with my roggenbier pouring out. So I little-Dutch-boy the thing, which I have to say works surprisingly well. With my other hand I manage to get my clean keg open, and then I dump the beer in. Good times.
(Yes, I always tighten that nut by hand.)