On our summer trip to Michigan I convinced my wife, Missy, and my wife's niece/nephew, Casey & Grace, to go on the Rip Cord ride at Michigan Adventure. Everyone of course loved the ride and Missy described it as "5 seconds of sheer terror." Check out this video on YouTube -- I haven't had an experience like this since I was jumping out of C-141s in the Army.
The ride puts you in a harness and then lifts you 180 ft in the air, one person pulls a ripcord, and then you free fall at speeds between 70-80 mph until you bottom out at 6' and then pendulum back and forth in a huge arc. A company named Skycoaster manufactures the rides and if you're looking for one near you, check out this list of locations.
Definitely not just another ride in the park!

