Sierra Roller
It's not necessarily the known areas of turbulence that will get you. I regularly fly over the Southern Sierra so some turbulence is usually a part of every flight.
-8A, 7500 enroute home from Kern Valley (L05) to Inyokern (IYK) over the Southern Sierra, in the clear with 20+ kts of tailwind. Nothing unusual - fat, dumb and happy as I approached the next to last ridgeline before descending to 3200 ft.
First roller rolled me to about 90 degrees RWD, second immediately after had me nearly inverted, nose down. No problem recovering from unusual attitude - RV's are so forgiving, just simulate winding your watch to get your hands off stick and neutralize controls, roll wings level the pull to horizon. G meter showed +4.5 and -3.2g's.
Number of G's weren't an issue - the rapid onset is what got my attention. Two really big instant thumps!
After landing, removed tail fairing to check - no damage.