Some Travel Pictures Just Beg For an Explanation

Mind The GapI took this picture in a tube station in London. “Mind the Gap” is a common warning posted throughout the underground system and blasted from audio speakers continuously. Although I understand the purpose of the warning, I could never figure out why every-other sign is mounted upside-down. One local suggested that it was so the sign could be read if you fall onto the tracks. Hopefully, he was just joking.