Still the most terrifying way to die I can imagine is falling into a supermassive black hole.

On a regular stellar mass black hole, the point at which it rips you apart atom-by-atom due to the difference in force being exerted on one end of your body versus the opposite end by gravity (a process lovingly referred to as "spaghettification") exists outside the event horizon, so you're dead long before you reach the point of no return. Still horrifying beyond measure, but at least it's a quick death.

On a supermassive black hole, however, the event horizon is so obscenely massive that you hit it before you get spaghettified, which means someone falling into one could theoretically fall past the event horizon without dying first and indeed might actually die of dehydration/starvation before reaching a point where gravity tears you apart if it's big enough. What would you experience? Would the neurons in your brain just stop working from physics breaking down, or would you exist in an infinite plane of pure darkness just wondering when it's going to end with no warning, or something else entirely?