*justin is walking down the stairs holding a box*
*justin continues walking down the stairs*
justin: holy crap. i haven't been looking at the stairs!
justin: just keep going without looking. you've been find so far
justin (taking a step, leg is wobbly): AH! where is the step?!
justin: nope. i've lost my stairs confidence... i gotta look down
justin (looking down into lava pit, standing at last stair): oh. oh wow.
justin: what a weird staircase
I usually psych myself out by the time I get to the final step or two. Replace that box with my Wendell dog and you have what I do multiple times a day.