https://www.youtube.com/watch?v=yHopAo_Ohy0
>I like an escalator, man, because an escalator can never break. It can only become stairs.
>There would never be an "Escalator Temporarily Out of Order" sign. Only "Escalator Temporarily Stairs. Sorry For The Convenience."
I've encountered such a sign!
Problem is that stopped escalators cause certain cognitive problems: some unconscious part of the brain anticipates that the escalator _will_ work and attempts to compensate appropriately as you put your foot onto the step. It is not uncommon for someone to stumble or even fall when they take their first step onto a stopped escalator.
A similar sensation can occur as you're scrolling while browsing, when the page hits an upper/lower limit and ceases to scroll. The brain anticipates that the text will continue to scroll but it doesn't, and that causes an "upset" sensation, a dissonance, if you will, that actually hurts somewhat! It feels as if your eyes are crossing!