visit the corporate elearning portal to do the mandatory trainings.. open browser, go to the page, login. start the training, then a quiz question pops up...
my IT sense tingling... open browser's developer tools, starts checking the HTML and JS source... then suddenly found something like this:
isCorrect = selected.join() === anwsers.join()
placed break point, put in random anwser, checked watch... (heartbeat increasing)
see the value is FALSE. Changed to TRUE manually, resume code...

Thank you, your anwser is correct!

WTF? I don't consider myself as a developer, but it's still hurts...