C172 Sideslips
I owned a C170 ( forerunner of the 172 with a tailwheel) for several years. Early on in my ownership I wondered why the pilots handbook cautioned against sideslips with full flap.
One day I tried it at a safe height. On the third attempt with full flap at 70mph the usual approch speed, I applied full rudder and slipped, after a few seconds the nose dropped through almost 90 deg at a rate that threw me against the seat straps. The elevator lost its feel as though the cable had snapped.
I recovered in 300-500 feet. At certain angles of slip the tailplane is obviously blanked. I didnt do it again-the handbook was correct!!