I have an amusing anecdote regarding Screamin' Demon that some of you might enjoy.
The years have all seemed to run together, but I'm going to say this happened in '79 maybe.
The launch mechanism was always trouble-prone and sometimes the train would not have enough speed/momentum to make it all the way up the far side. The chain dogs would keep the train from rolling back down the hill and, depending on the exact position of the train, the guests would be assisted out of the cars and allowed to walk down the steps.
But if the train was too far back on the slope it was deemed unsafe to evacuate the cars, and steel-coaster maintenance would need to manually release the chain-dogs, allowing the train to roll back down the slope where it would eventually come to a stop at the bottom of the loop. The train would then be evacuated safely.
That scenario unfolded one day and I was a close-up witness of it.
I should note here that the situation I just described was not uncommon and, although it did not occur every day, it occurred often enough that anyone working on the Demon was thuroughly familiar with the procedure.
Anyway, to get back to the story... on this particular day the train, when released, travelled backward down the slope, and up the loop far enough to strike a perfect balance at the top of the loop. It remained motionless at the top of the loop, upside down, full of guests... and things started falling into the water below... sunglasses, purses, hats, and anything else that was loose...
Although it seemed much longer at the time, it only hung there for about a minute or so before the squirming of the guests finally unbalanced the train, sending it back down to the bottom of the loop where it gradually came to rest.
Thankfully, no one was injured during this incident so I don't feel too out-of-line calling it "humorous".