Euthanasia Coaster (2010)
julijonasurbonas.lt
julijonasurbonas.lt
Seems like the drop is entirely unnecessary and mainly gamifies it, since the user has to press the button. You could easily just have an Incredicoaster-style magnetic propulsion system that takes you to 220 mph, producing the same effect without the distress. Other than the drop, losing consciousness in this way is relatively pleasant as a way to go (I know because it has happened to me).
[1]: https://www.wired.com/story/human-plus-science-gallery/
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To be honest I’m a bit amazed: it manages to stay fairly readable while inducing an incredibly realistic fear of an imminent stroke.