I've been stuck on the Universe of Energy more times, and for more time than I can recount. I refused to ride it for several trips cause when you get stuck in there, it takes forever to get moving again.
The worst time was the last time we rode it before they did the Ellen-makeover. We were stuck in the ride vehicle for 45 minutes, they sent CM's out who weren't in uniform who were manually driving the cars. People got really mad and started trying to climb out, it's one of the few times I've ever heard a CM shout. He was yelling that people shouldn't climb out of the cars, because they could lose a limb when they started moving again. He really seemed panicked, I felt bad for him. Some people did climb out, but most stayed seated.
A couple times we were stuck in there for brief periods and at funny locations, I remember one time my sisters and I singing several rounds of the "Energy" song to the amusement of our fellow riders LOL.
More stops on SE and IASW than I can count, all brief. The scariest thing I've ever seen though was last time we rode IASW the little spinning skater girl was stuck. She was making this horrible ca-chunk noise as her gears ground, and I smelled something burning. When we got off we reported it to the CM's and they shut her circuit breaker off...