I better not fly over the Alps again then...
Learn something every day.
But, seriously, would an experienced pilot not know that one needs to fly a fair way above the ridges to avoid the turbulence? Or is low flying a part of the thrill?
One rule I read somewhere, which doesn't seem far off based on what I have come across, is that you need 1000ft above the ridge for every 10kt of wind blowing across it, to keep downdraughts below 500fpm.