https://concrete-glib-burglar.glitch.me
A little project I created. If you know what to do, you can read the contents of a file called SECRET without leaving your browser. DM me the contents of the file and I will announce the first person to finish.
Edit: I shut down the project: the winners are @wh0 and @anon43649539. I will being something like this again near future!
To get the contents of the SECRET file, you would have had to run && cat SECRET
in the form.