i've seen it a few times. i did it myself. once. way early on before i
knew what the hell i was doing. everyone else who i've seen do it, or
talked to who did it, were also convinced it was probably not the best
idea. I think most of us had that realization somewhere around 200
degrees of turn I think...

I've seen a pilot do a 270 at the base/final turn point. Obviously not
a good idea. Can't imagine someone doing a full 360 while on final.