I've gone on a few aerobatic rides in the past 20 years. Starting with a Pitts S2B, an F16 ride, a P51 ride, formation acro in a T6, formation acro in an Extra 300 and in @EdFred 's Comanche around the pattern (maybe a couple others I missed). Somehow in all these flights and being around aviation for 2 decades I managed to miss hearing the term "Lomcovak". My wife just went on her first acro flight (Extra 300) and she did one of these. I asked a co-worker (former acro pilot in college) if he had heard of them and he said, "it's like having your body ripped apart". So I looked it up online to read about it. Here is what Paul Bertorelli says, "I’d forgotten how unpleasant they are. Negative Gs pretty much suck and a lomcovak is carefully contrived to force all five quarts of blood north of the eyeballs. Molidor had me snug up the seatbelt ratchet before we entered the maneuver and if you’ve done one, you know why. If that belt ever failed, you’d come out of the seat and through the canopy like $#@% through a goose." https://www.avweb.com/insider/you-want-a-lomcovak-with-that/ If it was possible, I have even more respect for my wife after acting like it was nothing. Is this more common than I was thinking?