I was coming down a down escalator when I saw a young woman approaching it down below.
"Oh, she's going the wrong way," I thought, "I hope she sees it in time."
The woman, who was sans phone or anything distracting, looked at the escalator and put her foot on it. I gasped, fearing for her safety. However, the escalator gently spat her back out. She then tried putting her foot on it again, but it again pushed her back.
Finally, she looked up at me coming down and asked, "what the hell is wrong with this thing?"
"Uh, the up escalator is on the other side," I explained.
She grimaced and angrily exclaimed, "there's another one?!" before walking towards the other side.