I very nearly lost my Local ticket in Singapore. We had Sgt controllers who, in those days, only did Local. So the rest of us hardly ever got a look in once we were endorsed, unless one of them went on leave. I found myself up there, after many many months away to find myself in the middle of an Exercise! WSRT was the target for attacks, and launching both attackers and defenders. It only took about an hour for me to lose the plot completely with about a dozen on frequency, all priority scrambles, launches, attacks and recoveries.
OC Flying (MWPK) wanted my ticket, but SATCO persuaded him otherwise.