As to groundlooping a tail wheel airplane I have to confess I never got to experience that realm of landing or take off.
Me neither, in well over 30 years of tailwheel flying. Closest I came was when I'd sold my Yak52 share and moved back to my beloved Chipmunk, first landing in it in over 3 years.
I'd got lazy feet! I vacated the grass runway to the left at a fair lick, and felt the tail begin to step out determinedly to the right, precursor to a groundloop to the left. Full right rudder to correct didn't do it, so brake was applied (right brake of course, and as I already had full right rudder in I just had to hoink back the brake lever, hard, with my left hand to get full right brake). That did the trick. Just!