My dad was taking aerobatic lessons when I was in high school and I asked if I could get a ride. He set up a time with his instructor and told him to make me puke... He tried everything, but to no avail. He threw me around for about an hour before I started to feel a little ill, but by that time, so did he and we decided to call it a session. I meant to go back for round 2, but never took him up on the offer. I still think about doing that again.
The hammerhead stall looks so smooth from the ground, but it feels like the plane wants to rip apart. I also messed him up in one maneuver, as my knee hit the stick and he could not get the plane to roll right. That was the only "Oh Sh-t" moment... I was trying to keep my knees as far to the sides as possible, but he really snapped the stick. The hand held radio that I *thought* was secured to the floor, was not and that was a surprise as it flew from the floor to the ceiling on the first roll. Good times.