The first time I went on... ok, I forget the name of the ride, but it's the indoor big coaster at King's Island. (they may have more than one by now, though...) Anyway, it is one that starts out propelled by magnets, so it's 0-60 in like 3 seconds. They start us out, we rocket down this hallway, and just as we come to the end of the hallway and are about to go into the actual coaster, the brakes slam on and stop the ride. We're all sitting there for a couple minutes, and then ride people reach us and tell us that the computer calculated that we didn't have enough momentum to make it around the first loop. If they hadn't stopped the ride, we would have gone halfway through the first loop, then rolled backward and back toward the start.
Anyway, they let everyone out, and had to do diagnosis stuff for like the next half hour. Pretty much everyone left except me and a couple friends. When the ride was up & running again, we got to ride right up front - kinda nice. I rode that ride again later toward the back, and it was almost worthless not being up front.
Was kinda funny - while talking to the ride operators while they were doing diagnostics, they said when they were building the coaster they were playing with the magnet launcher. Someone dropped a metal can between the magnets and launched it halfway across the park!
I got stuck on a ride at 6 Flags 
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