An idea that in certain types of death, there is no possibility of your demise registering in your consciousness.    Swan diving from a height of over 200 ft is one of many ways to achieve this.

Taken to to another extreme, a large aircraft could reach several times terminal velocity if it crashed at a steep angle.  At 400 mph, the laws of physics say that it would be impossible to register pain or distress at the moment of impact.  It's just a cut to black for you in 1/100th of a second.    Our existence is just that fragile, some day we'll all be a bug on a windshield.