Yes.
While building routes for an indoors climbing contest, I quickly climbed up the easiest to test it. Preparing to
jump back down, I turned around to look at my partner holding the rope. There wasn't one. I forgot to
secure myself. If I hadn't turned around to look first, I would've jumped down 5 m backwards on the tools
and the other equipment. It was a rather shaky climb back down.

Have you ever travelled to the wrong destination and only realized it when you arrived and couldn't find
your hotel?