Honestly nothing really comes to mind. Outside of Bitcoin I've done quite a lot of dangerous - and dangerous-looking - sports like caving, climbing, etc. Being alone on a cliff, 800m above the ground, climbing a via feratta in Switzerland last summer was humbling in a very visceral way that far exceeds anything Bitcoin related. That was actually perfectly safe, as climbing gear works really well and intellectually I certainly knew that. But it sure as heck felt humbling...