clear air turbulence

any one ever been through clear air turbulence?? I have. It was way back in the day(1986) :laughing: I was on a flying tiger 747 from sfo to tokyo narita. A couple of hours out of japan the aircraft just lost lift. I swear we dropped 1000 feet of altitude. when we got lift after our drop, the wings flexed 10 or 15 feet. I have never forgotten it.