I renamed a file ‘readme’ to ‘README’ so it would be more visible in the file listing of a website (with no index page). Though it was visible in the file listing on the command line (ls), it disappeared from the file listing of the web folder. I was puzzled for a while and then changed ‘README’ to ‘README.txt’, and — acrabadabra — it appeared as text under the file listing!

Extremely wow.